Residual current circuit breakers with conditional shortcircuit

Transcription

1 LFE Residual current circuit breakers RESIDUAL CURRENT CIRCUIT BREAKERS LFE Residual current circuit breakers with conditional shortcircuit current 6 ka. They react to sine-wave residual current (type AC). For protection: against dangerous contact with live parts (I Δn 30 ma) against dangerous contact with dead parts against fire or short-circuit in reduced insulation capacity of electrical equipment (I Δn 300 ma). Mounting/dismantling on/from U rails: The latches enable very quick mounting and dismantling by hand, without any tool needed. Operating ambient temperature is for all designs already from -25 C to +5 C. Equipped with device status indicator. Wide range of accessories - auxiliary and signal switches, undervoltage releases and shunt trips, interconnecting busbars etc. Possibility of locking and sealing in off or on position. Possibility of interconnection with circuit breakers LTE, LTN by means of interconnecting busbars up or down. N-pole of residual current circuit breakers in switching on it closes before and in switching off it opens after the other poles. Residual current circuit breaker are testing once per 6 months. LFE AC Residual current circuit breakers 2-pole, type AC Standard type for common use in building and housing installations up to 0 A, AC 230 V. Surge current resistance 250 A (8/20 μs) I Δn I n Type Order Number Weight Package [ma] [A] code of modules [kg] [pcs] 0 6 LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC Residual current circuit breakers -pole, type AC Standard type for common use in building and housing installations up to 80 A, AC 230/00 V. Surge current resistance 250 A (8/20 μs) I Δn I n Type Order Number Weight Package [ma] [A] code of modules [kg] [pcs] 25 LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE-0--00AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: LFE AC OEZ: S2L AS-50-S-AL0 Accessories Auxiliary and signal switches PS-LT, SS-LT page B36 Shunt trips SV-LT page B37 Undervoltage releases SP-LT page B37 Locking inserts OD-LT-VU02 page B39 Interconnecting busbars S2L, S2L+N, S3L+N, S3L-...FI-.. ), SL page B5 Terminal extension AS-50-S-AL0 page B7 ) For interconnection of the residual current circuit breaker with a series of circuit breakers where the series of circuit breakers needs to start from N-pole of the residual current circuit breaker. C SV-LT PS-LT OD-LT-VP0

2 LFE RESIDUAL CURRENT CIRCUIT BREAKERS LFE Residual current circuit breakers Minia Specifications Type LFE-..-2 LFE-..- Standards EN EN EN EN EN 653 EN 653 Approval marks Number of poles 2 Type AC AC Rated current I n 6, 25, 0 A 25, 0, 63, 80 A Rated residual current I Δn 0, 30, 00, 300 ma 30, 00, 300, 500 ma Rated operating voltage U e AC 230 V AC 230/00 V Min. operating voltage U min for I Δn = 30 ma AC 95 V AC 95 V (for test button function) U min for I Δn 30 ma AC 00 V AC 00 V Max. operating voltage U max AC 250 V AC 250/0 V Rated frequency f n 50 Hz 50 Hz Rated conditional short-circuit current I nc 6 ka (see table below) 6 ka (see table below) Rated making and breaking capacity I m 500 A 800 A Surge resistance 250 A 250 A Mechanical endurance > operating cycles > operating cycles Electrical endurance > operating cycles > operating cycles Degree of protection - with connected conductors IP20 IP20 Mounting on U rail according to EN 6075 type TH 35 TH 35 Connection Conductor Cu - rigid (solid, stranded) ) mm mm 2 Conductor Cu - flexible ) mm mm 2 Screw head type PZ2 PZ2 Torque Nm Nm Top or bottom connection top/bottom top/bottom Operating conditions Ambient temperature C C Working position arbitrary arbitrary Climatic resistance (EN ) 28 operating cycles 28 operating cycles (55 C, 95 % relative air humidity) (55 C, 95 % relative air humidity) ) For detailed connection of conductors see table on page C6. Protection of residual current circuit breakers A) Short-circuit protection In function principle, residual current circuit breaker is not possible to use for short-circuit protection. For circuit protection it is necessary to use a fuse or a circuit breaker, that cuts the short-circuited circuit safely off. The residual current circuit breaker must only withstand the through-going short-circuit current. The amplitude of the maximum through short-circuit current is defined as rated conditional short-circuit current I nc. The table below indicates the rated conditional shortcircuit current depending on the max. backup fuse and the circuit breaker. Rated conditional short-circuit current with backup fuse Design Rated current I n Max. backup Rated conditional short-circuit current LFE [A] fuse gg I nc [ka] 2-pole A 6 ka A 6 ka -pole A 6 ka B) Protection against overload Protection of the residual current circuit breakers against overload may be provided by fuses or circuit breakers subject to following conditions: - rated current of the fuse-link must be by one degree lower than rated current of the residual current circuit breaker I n of the fuse by one degree lower I n of the residual current circuit breaker - rated current of the circuit breaker must be equal or lower than the rated current of the residual current circuit breaker I n of the circuit breaker I n of the residual current circuit breaker. Rated conditional short-circuit current with backup circuit breaker Residual current Backup circuit breaker Rated conditional short-circuit current circuit breaker Type I n of the circuit breaker I nc [ka] LFE LTP, LTK, LTS, LVN I n MCB In RCCB 6 ka Powers losses P Design Rated Rated residual current I Δn [ma] LFN current I n [A] AC AC AC AC AC W/pole pole W/pole 0.6 W/pole 0.6 W/pole W/pole.6 W/pole.6 W/pole W/pole 0.7 W/pole 0.7 W/pole - -pole W/pole 2.0 W/pole 2.0 W/pole.8 W/pole W/pole 3.9 W/pole 3.9 W/pole 3.9 W/pole W/pole -. W/pole - C5

3 LFE Residual current circuit breakers RESIDUAL CURRENT CIRCUIT BREAKERS LFE Connection range Number of connected conductors Rigid conductor (solid, stranded) Conductor flexible with a sleeve Conductor flexible without a sleeve ) x conductor x ( ) mm 2 x ( ) mm 2 x ( 35) mm 2 2x conductor 2x (0.75 0) mm 2 2x (0.75 ) mm 2 2x ( ) mm 2 x conductor + interconnecting busbar x (0 25) mm 2 + interconnecting busbar x (6 6) mm 2 2) + interconnecting busbar - pin thickness max..5 mm pin thickness max..5 mm ) The conductor must be twisted before insertion to a terminal; individual conductor fibres must not stick out of the terminal. 2) In case of use of a sleeve without plastic neck: conductor x (6 25) mm 2. If more conductors are used they must be of the same type and cross-section. Dimensions LFE LFE Diagram LFE LFE-..- N 3 5 N 2 N 2 6 N Connection Standardní zapojení connection 2pólového of 2-pole residual proudového current chrániče circuit breaker LFE LFE Standardní connection zapojení pólového of -pole residual proudového current circuit chrániče breaker LFE LFE -pole pólový residual proudový current chránič circuit LFE breaker v LFE fázových in -phase obvodech circuits with s N-pólem N-pole -pole pólový residual proudový current chránič circuit LFE breaker ve LFE 3fázových in 3-phase obvodech circuits without bez N-pólu N-pole L N L L2 L3 N L N L L2 L3 N 3 5 N 3 5 N 3 5 N 2 N 2 6 N 2 6 N 2 6 N C6

4 Miniature circuit breakers Auxiliary switches PS-LT-0200-TE Accessory to: miniature circuit breakers: LTP, LTK, LTS, LVN, LTN-UC residual current circuit breakers: LFN, LFE residual current circuit breakers with overcurrent protection: OLI, OLE (installation on OLI/OLE requires handle adapter OD-OL-NR0 see page B38 except for PS-LT-00-K) switches: MSO, MSN, AVN-DC. For signalling the position of contacts of the device in switching off by releases or manually, i.e. in switching off by overload, short-circuit, shunt trip or undervoltage release, residual current and manually by control lever. Mounting on the right side of the device. For the number of auxiliary switches connected to the device in combination with the other accessories see page B. Width 9 mm. Auxiliary switch function can be checked by test lever on the front side of the device (version PS-..-TE). Variant for switching small direct current voltages up to DC 30 V. They are suitable for application in SELV and PELV circuits - sufficient insulation is provided between the circuit breaker and the auxiliary switch. PS-LT-0200 Design Arrangement Type Order Number Weight Package of contacts ) code of modules [kg] [pcs] PS-LT-00 OEZ: Standard 20 PS-LT-2000 OEZ: PS-LT-0200 OEZ: PS-LT-00-TE OEZ: With test and reset lever 20 PS-LT-2000-TE OEZ: PS-LT-0200-TE OEZ: For small voltages standard PS-LT-00-MN OEZ: For small voltages with test lever PS-LT-00-MN-TE OEZ: With handle adapter OD-OL-NR0 2) PS-LT-00-K OEZ: ) Each digit indicates successively the number of make and break contacts. 2) PS-LT-00-K is a set for convenient ordering in installation on OLI/OLE. The other designs of the auxiliary switches installed on OLI/OLE require separate ordering of OD-OL-NR0. SS-LT-2000 SS-LT-2000-TE-RE Signal switches Accessory to: miniature circuit breakers: LTP, LTK, LTS, LVN, LTN-UC residual current circuit breakers: LFN, LFE residual current circuit breakers with overcurrent protection: OLI, OLE (installation on OLI/OLE requires handle adapter OD-OL-NR0 see page B38) switches: MSN. For position signalling of main contacts of the device in switching off by releases, i.e. in switching off by overload, short-circuit, shunt trip and undervoltage release or residual current. Mounting on the right side of the device. For the number of auxiliary switches connected to the device in combination with the other accessories see page B. Auxiliary switch function can be checked by test lever on the front side of the device (version SS-..-TE). Signal switch can be reset by means of the red reset lever on the front side of the device without switching the device on by the control lever (version SS-..-RE). They are suitable for application in SELV and PELV circuits - sufficient insulation is provided between the circuit breaker and the signal switch. Reaction in switching off by releases: in switching off by releases the make/break contact will break/make for details see the table on page B. Design Arrangement Type Order Number Weight Package of contacts ) code of modules [kg] [pcs] SS-LT-00 OEZ: Standard 20 SS-LT-2000 OEZ: SS-LT-0200 OEZ: SS-LT-00-TE-RE OEZ: With test and reset lever 20 SS-LT-2000-TE-RE OEZ: SS-LT-0200-TE-RE OEZ: ) Each digit indicates successively the number of make and break contacts. B36

5 ture circuit breakers Minia Shunt trips Accessory to: miniature circuit breakers: LTS, LVN, LTN-UC residual current circuit breakers: LFN, LFE residual current circuit breakers with overcurrent protection: OLI, OLE (installation on OLI/OLE requires handle adapter OD-OL-NR0 see page B38) switches: MSN. They are used for device switching off by applied voltage. Mounting: on the right side of the device one shunt trip can be connected to one device in combination with the other accessories - see page B. SV-LT-X00 Rated voltage Type Order Number Weight Package U c code of modules [kg] [pcs] AC/DC 2 60 V SV-LT-X060 OEZ: AC 0 5 V / DC V SV-LT-X00 OEZ: Undervoltage releases Accessory to: miniature circuit breakers: LTS, LVN, LTN-UC residual current circuit breakers: LFN, LFE residual current circuit breakers with overcurrent protection: OLI, OLE (installation on OLI/OLE requires handle adapter OD-OL-NR0 see page B38) switches: MSN. They are used for tripping the device at loss of voltage as well as at gradual decrease of voltage. They are used for elimination of closing of circuit breaker if voltage is lower than 35 % U c (switching is possible at voltage higher than 85 % U c ). They are often used for protection against device restart following mains failure. Mounting: on the right side of the device one undervoltage release can be connected to one device in combination with the other accessories - see page B. SP-LT-A230 Rated voltage Arrangement Type Order Number Weight Package U c of contacts ) code of modules [kg] [pcs] AC 230 V - SP-LT-A230 OEZ: SP-LT-A OEZ: DC 2 V - SP-LT-D02 OEZ: SP-LT-D OEZ: DC 0 V - SP-LT-D0 OEZ: SP-LT-D OEZ: ) Each digit indicates successively the number of make and break contacts. B37

6 Miniature circuit breakers OD-OL-NR0 Handle adapter OD-OL-NR0 Accessory to: OLI, OLE. It enables installation of the following accessories on residual current circuit breakers with overcurrent protection OLI, OLE auxiliary switches (PS-LT) signal switches (SS-LT) undervoltage releases (SP-LT) shunt trips (SV-LT). Special auxiliary switch PS-LT-00-K contains the handle adapter OD-OL-NR0. So it is not necessary to order it separately. Type Order Weight Package code [kg] [pcs] OD-OL-NR0 OEZ: Example of installation 2 OD-OL-NR Locking insert OD-LT-VU0 Accessory to: miniature circuit breakers: LTK, LVN, LTN-UC residual current circuit breakers: OLI, OLE switches: MSN, AVN-DC. For safe locking of the control lever in off or on position. The protective function of the devices is functional even in locked position. Maximum diameter of lock rod - 3 mm. The lock is not included in the package. Type Order Weight Package code [kg] [pcs] OD-LT-VU0 OEZ: OD-LT-VU0 B38

7 ture circuit breakers Minia OD-LT-VU02 Locking insert OD-LT-VU02 Accessory to: miniature circuit breakers: LTP, LTS residual current circuit breakers: LFN, LFE switches: MSO. For safe locking of the control lever in off or on position. The protective function of the devices is functional even in locked position. Maximum diameter of lock rod - 6 mm. The lock is not included in the package. In installation it is necessary to press the fixing springs of the insert by two fingers against each other, and then slide them in the holes in the circuit breaker. In case of pressing the insert against the circuit breaker body a part of the plastic cover could break off! Type Order Weight Package code [kg] [pcs] OD-LT-VU02 OEZ: Sealing insert OD-LT-VP0 Accessory to: miniature circuit breakers: LTP, LTS, LVN, LTN-UC residual current circuit breakers: OLI, OLE switches: MSO, MSN, AVN-DC. For covering and sealing of terminal screws. OD-LT-VP0 Type Order Weight Package code [kg] [pcs] OD-LT-VP0 OEZ: B39

8 Miniature circuit breakers Specifications of auxiliary and signal switches DC-3 2) Type PS-LT PS-LT-00-MN SS-LT PS-LT-00-MN-TE Standards EN EN EN 6209 EN 6209 Approval marks Arrangement of contacts ), 20, 02, 20, 02 Rated operating voltage/current U e /I e 00 V 2 A - AC V 6 A - AC- 00 V 2 A V 6 A - 0 V A/0.75 A - 60 V 3 A/.5 A V A/0.5 A - 2 V 6 A/3 A - Max. voltage/current - DC 30 V / 00 ma Min. voltage/current 2 V / 50 ma DC 5 V / ma Backup protection - fuse / miniature circuit breaker 6 A gg / 6 A characteristic B, C 6 A gg / 6 A characteristic B, C Mechanical endurance operating cycles operating cycles Electrical endurance at I e operating cycles operating cycles Degree of protection IP20 IP20 Connection Conductor Cu rigid (solid, stranded) mm mm 2 Conductor Cu flexible mm mm 2 Torque 0.5 Nm 0,5 Nm Connection top/bottom top/bottom Operating conditions Ambient temperature C C Working position arbitrary arbitrary Climatic resistance according to IEC operating cycles 28 operating cycles Shocks (EN ) m/s 2 50 in ms half-sine pulse 50 in ms half-sine pulse Vibration resistance according to IEC m/s 2 50 at 0 50 Hz 50 at 0 50 Hz ) Each digit indicates successively the number of make and break contacts. 2) Value according to EN 6209 / according to EN Function of signal switch SS-LT Circuit breaker contact state The state of the MAKE signal contact SS-LT- * Initial position - contacts open switched off Switching on manually - contacts closed switched on Switching off manually - contacts open switched on Switching off by release - contacts open switched off * The break contact works in opposite way. B0

9 ture circuit breakers Minia Specifications of shunt trips and undervoltage releases Type SV-LT SP-LT Standards EN EN Approval marks Mounting on the right side of the device on the right side of the device Degree of protection IP20 IP20 Control circuit coil Rated voltage U c AC/DC 2 60 V AC 230 V AC 0 5 V / DC V DC 2, 0 V Range of rated voltage 0.7. U c U c Voltage range for switching off - < U c Rated frequency f n 50/60 Hz 50/60 Hz Backup protection - fuse / miniature circuit breaker 6 A gg / 6 A characteristic B, C 6 A gg / 6 A characteristic B, C The length of impulse necessary for device switching off 5 ms Contact Arrangement of contacts ) - 20 Rated operating voltage/current U e /I e AC V / 6 A Min. voltage/current - 2 V / 50 ma Backup protection - fuse / miniature circuit breaker - 6 A gg / 6 A characteristic B, C Connection Conductor Cu rigid (solid, stranded) mm mm 2 Conductor Cu flexible mm mm 2 Torque 0.8 Nm 0.8 Nm Connection top/bottom top/bottom Operating conditions Mechanical endurance operating cycles operating cycles Electrical endurance operating cycles operating cycles Ambient temperature C C Working position arbitrary arbitrary Climatic resistance according to IEC operating cycles 28 operating cycles Shocks (EN ) m/s 2 50 in ms half-sine pulse 50 in ms half-sine pulse Vibration resistance according to IEC m/s 2 50 at 0 50 Hz 50 at 0 50 Hz ) Each digit indicates successively the number of make and break contacts. B

10 Miniature circuit breakers Dimensions PS-LT, SS-LT 73.3 SV-LT SP-LT 73.3 C D C2 D LTK, MSN, OLI, OLE, AVN-DC, LTN-UC, LVN + OD-LT-VU0 + OD-LT-VP0 OD-LT-VP0 OD-LT-VU LTP, LTS, MSO + OD-LT-VU B2

11 ture circuit breakers Minia Diagram PS-LT-00, PS-LT-00-K PS-LT-2000 PS-LT-0200 SS-LT-00 SS-LT-2000 SS-LT PS-LT-00-TE PS-LT-2000-TE PS-LT-0200-TE SS-LT-00-TE-RE SS-LT-2000-TE-RE SS-LT-0200-TE-RE TEST TEST TEST TEST TEST TEST SV-LT-.. SP-LT SP-LT C C2 D A 3 23 U< U< D2 D2 2 Installation of auxiliary switch, shunt trips or undervoltage releases For installation of an auxiliary switch, shunt trip or undervoltage releases on a circuit breaker, residual current circuit breaker or switch, the same procedure shall apply as described on the example of installation of the auxiliary switch on the circuit breaker in the following points.. In mounting the levers of auxiliary switch and of the circuit breaker are in ON position. 2. Tilt both fixing springs of the auxiliary switch to the right so that they do not get between the auxiliary switch and circuit breaker in installation. 3. Slide the auxiliary switch onto the circuit breaker from the right.. Lock the fixing springs in the circuit breaker body so that the auxiliary switch cannot release. 5. Check correct function by switching B3

12 Miniature circuit breakers Combination of accessories LTP, LTK Any combination of PS-LT and SS-LT, max. 2 units Any combination of PS-LT and SS-LT, max. 2 units or LTS, LFE, LFN, OLE, OLI* SV-LT * Installation of accessories on OLI/OLE requires handle adapter OD-OL-NR0 see page B38. SP-LT Any combination of PS-LT and SS-LT, max. 2 units Any combination of PS-LT and SS-LT, max. 3 units or LTN-UC, LVN, MSN* SV-LT * Installation of signal switches SS-LT on the MSN switch, only with SP-LT or SV-LT SP-LT Any combination of PS-LT and SS-LT, max. 3 units B MSO, AVN-DC PS-LT max. 3 units

13 Residual current circuit breakers Minia BASIC TERMS, SYMBOLS AND BREAK TIMES Rated residual operating current I Δn is the value of residual current I Δn specified by the manufacturer, at which the residual current circuit breaker must switch out under specified conditions. Alternating residual current must by cut off by the residual current circuit breaker within (0.5 ) I Δn. Rated current I n is the value of current specified by the manufacturer, which can be transferred by the residual current circuit breaker continuously. So the current I n can pass through the contacts for an unlimited time. Therefore it is, for instance, possible to use a residual current circuit breaker with I n = 25 A in the circuit with max. current up to 25 A. For protection against overload of the residual current circuit breakers LFE, LFN, OFI it is recommended to use the circuit breakers LTE, LTN, LVN with rated curren I n MCB I n RCCB. Rated operating voltage U e is the voltage the residual current circuit breaker is to be connected to and which properties are related to. The connected voltage has no effect on the device function but on the function of the test circuit and isolation properties. Rated frequency f n is the frequency the residual current circuit breaker is designed for and at which it works correctly under stated conditions. Majority of residual current circuit breakers are designed for f n = 50 to 60 Hz. As the residual current circuit breaker function is based on the induction principle, the residual current behaviour and frequency show an effect upon tripping. When using a device designed for 50/60 Hz in a network with a different frequency, the user must count on a change of the tripping threshold i.e. a change of I Δn. Rated conditional short-circuit current I nc shortcircuit strength. The function and design principle does not allow to use the residual current circuit breaker for protection against short-circuit. For circuit protection it is necessary to use a circuit breaker or a fuse. These elements cut the short-circuited circuit safely off. The residual current circuit breaker must only withstand the through-going short-circuit current. The amplitude of the maximum through current is defined as rated conditional short-circuit current I nc. The short-circuit strength is then expressed by the current I nc. For example, on the rating plate I nc = 0 ka is expressed by the following symbol: Ambient temperature T for the residual current circuit breakers is (-5 +0) C according to almost all international standards. Some residual current circuit breakers work in an extended range (-25 +0) C. This possibility is identified by the following symbol on the rating plate: -25 Residual current circuit breaker type AC rreacts to sine-wave residual current it is used in conventional AC networks Residual current circuit breaker type A eacts to sine-wave alternating and pulsating direct residual currents it is used in conventional AC networks and the networks with phase power regulation etc. Residual current circuit breaker type G special residual current circuit breaker reducing the number of undesirable cut-offs. It is mainly installed before the devices causing short-time (up to 0 ms) stray currents. Identification: G Surge resistance: 3 ka (8/20 μs) Release delay: 0 ms G Residual current circuit breaker type S special residual current circuit breaker, which is mainly intended for selective switching of residual current circuit breakers and reduction of undesirable cut-offs. It is installed before the devices causing short-time (up to 0 ms) stray currents. Identification: S Surge resistance: 5 ka (8/20 μs) Release delay: 0 ms S Selective (discriminating) switching means that if the residual current circuit breakers are connected in series, only the device in which circuit a failure occurs will cut off the current. More specifically, only the device in which the tripping residual current appears due to a failure in the protected circuit will turn off the current. The advantage consists in maintaining the power supply in the other circuits not affected by the failure. Such function of the protected circuit is achieved by connection of the selective residual current circuit breaker (see Fig. ) before the standard or G type residual current circuit breaker, with the following ratio of rated residual currents: I ΔnS I Δn -,G I Δn S 3 x I Δn -,G rated residual operating current of the selective residual current circuit breaker rated residual operating current of standard or G type residual current circuit breaker he main reason of selective disconnecting of circuits is higher time delay of the selective residual current circuit breakers in tripping (compared to standard or G type ones). load I ΔnS I = 0. A Δn- I = 0.03 A ΔnG load Fig.. Simplified example of selective connection of residual current circuit breakers Residual current circuit breaker with overcurrent protection the device is a combination of residual current circuit breaker and circuit breaker with 2-module width it saves the space in the switchboard compared to conventional connection of two separate devices (3 modules). This eliminates the problem of backup protection and interconnection. The disadvantage of such a design compared to conventional one is that it is not possible to identify whether the tripping was actuated by the residual current circuit breaker or by the circuit breaker. Min. time delay and break times of the residual current circuit breakers Type of residual current circuit breakers standard type G type S Min. time delay T v s Break times t at I Δn s t t t 0.5 (according to EN 6008-) at 2I Δn s t t t 0.2 at 5I Δn s t t t 0.5 at 500 A s t t t 0.5 note no bottom limits of the break time value 0.0 s is not given by standard break times are valid for the residual current circuit breaker with I n 25 A and I Δn > 0.03 A C27

14 Residual current circuit breakers BASIC TERMS, SYMBOLS AND BREAK TIMES Examples of characteristics The characteristics indicated below are based on requirements of EN and valid for: standard residual current circuit breakers and residual current circuit breakers with G type delay with I Δn = 30 ma residual current circuit breakers with S type delay with I Δn = 00 ma Break time [ms] S Selective (inactivity time min. 0 ms) 50 0 G with delay (inactivity time min. 0 ms) Standard (undelayed) Valid for: I Δn = 30 ma 0.05 G Residual current I Δ [A] I Δn = 00 ma S I Δn 2I Δn 5I Δn I Δn 2I Δn 5I Δn C28