PHNOI MOTOR PROTTORS WHY PROTT MOTORS? Overheating of motor insulation causes reduction in dielectric strength which can result in motor insulation damage or failure. The following are causes of motor overheating for which lixon motor protectors can be applied to achieve protection: Prolonged running overload ocked rotor: mechanical / electrical failure to start ow line voltage High ambient temperature and lack of ventilation eatures Normally closed make or break lixon contact system, which is operated by a snap action disc, is sensitive to both temperature and current. Precision calibration temperature calibrated and inspected under controlled conditions for dependable performance. utomatic or manual reset series available asy to install U recognized 15962 S certified R11372 V certificate with production surveillance, overheating protector. 37 amperes maximum locked rotor 2 V, ile 4464.4-4510-1013, icense No. 3938 U for M.P. only. Inherent protection devices for approximately 1/2 to 5 h.p. motors used in applications such as industrial motors, agricultural equipment, well and sump pumps, fans, air conditioners, refrigerators, home appliances, etc. When properly applied, protector shuts off motor when temperature exceeds maximum safe level due to an overload or stalled (locked rotor) condition. lixon Phenolic Motor Protectors are equipped with a bimetallic snap acting disc, on which the contacts are mounted, and through which the current flows. If overheating conditions occur, the heating effect of the current flow through the lixon disc and the influence of motor heat will cause the disc temperature to rise. When the disc reaches the calibrated setpoint, the lixon protector automatically opens and shuts down the motor, limiting the winding and shell temperature. When the motor has cooled to an acceptable operating level, allowing the protector to cool to its reset temperature, the lixon protector resets automatically to a closed contact position allowing the motor to restart. Manual reset versions are also available for applications where automatic restarting may be hazardous to equipment or operations. lixon is a registered trademark of Sensata Technologies, Inc. Printed in U.S.., Reprinted March 2014 Page 1 of 6
utomatic Reset xploded View ontacts Open over (Optional) imetal isc Heater Terminal Terminal ontacts losed Terminal djusting Screw Manual Reset Phenolic ase Printed in U.S.., Reprinted March 2014 Page 2 of 6
imensional rawings (Single Phase Types) Round ase.025 ±.005 (.635 ±.127) Type Max. MR R R R 1-1/4 1-1/2 1.031 ±.010 1.312 ±.010 1.6 ±.010 1.983 ±.010.970 ±.006 1.218 ±.010 1.555 ±.010 1.881 ±.010.125 ±.005.125 ±.005.156 ±.010.154 ±.010.625 ±.010.6 ±.010.9 ±.015.8 ±.015.171.218.313.375 23/64 ±1/32 31/64 ±1/32 27/64 ±1/32 15/32 ±3/64.375 ±.006.442 ±.006.442 ±.006.781 ±.006 ared ase R 1 R 2 H.113 ±.005 (2.87 ±.127).265 ±.002 (7.24 ±.051).065 ±.005/-.000 (.164 ±.254) ia. Holes.062 ±.010 (1.57 ±.254) eep (Type M 4-Holes. Type 2-Holes at #1 Terminal nd only. Other Types No Holes) Type H R 1 R 2 M 1-1/4 1-1/2.970 ±.010 1.187 ±.010 1.594 ±.010 1.875 ±.010 1.390 ±.015 1.390 ±.015 2.125 ±.010 2.125 ±.020.175 ±.010.175 ±.010.223 ±.010.267 ±.010.450 ±.015.464 ±.015.715 ±.010.890 ±.010.354.6.552.683.332 ±010.517 ±.010.436 ±.007.4 ±.008.4 ±.008.781 ±.006.625 ±.010.625 ±.010 1.000 ±.010 1.250 ±.010.176 ±.010.176 ±.010.218 ±.010.218 ±.010.953 1.000 1.180 1.370.970 ±.006 1.187 ±.010 1.552 ±.010 1.875 ±.010.656 ±.010.656 ±.010.844 ±.010 1.000 ±.010.845 ±.010.845 ±.010 1.344 ±.010 1.344 ±.010 Printed in U.S.., Reprinted March 2014 Page 3 of 6
Type ode Structure for Single Phase Phenolic Motor Protectors The following is an explanation of the type code which appears on each standard lixon phenolic motor protector. y using this code, it is possible to determine the following size, type of base, terminals, heater, disc and contacts type and operating temperature. M R P 36 X 63 Terminations M = = = 1 1/4 = 1 1/2 ase = ared commercial R = Round commercial = Round comm. cut down and cover * = ared comm. and cover S* = Round commercial and cover * xcept 1 1/4 size which always has cover. &R designate this. * Only 1 1/2 applications. Maximum Recommended Protector ontact Ratings This chart is used to determine protector size needed when making an application. 11/4 11/2 isc ontacts ST ST Terminals = 2 solder low cap H = 2 solder high cap = 2 std screw low cap M = 2 std screw high cap P = 2 stub low cap T = 2 stub high cap = 3 solder low cap = 3 solder high cap = 3 std screw low cap O = 3 std screw high cap P = 3 stub low cap T = 3 stub high cap Terminals ST ST Max. urrent V 32 50 80 135 175 Heater Selected to satisfy application requirements Max. urrent V = 2 = High apacity = ow apacity ST = Standard apacity or reference only. Plese contact Sensata for application asistance. 25 37 60 100 1 R High cap isc & ontact H I M P ow cap P S O T H I M N High cap H I X Operating Temperature Open ±5 V Z N X Y W U M R S = 90 = 105 = 105 = 105 H** = 150** P** = 150** O** = 150** utomatic Reset Open ±5 = 90 = 105 = 105 ** = 150** Manual Reset lose ±9 57** 61 69 78 61 69 78 92 61 69 78 92 102 78** 115** 102** lose ±12 54** 63*** 74* 74 96 96** * 1-Phase Protectors only. ** Special temperatures. onsult net additions. *** 3-Phase Protectors only. Printed in U.S.., Reprinted March 2014 Page 4 of 6
pplication Worksheet sample worksheet provides the information needed for a proper application. It is not possible to apply a lixon protector based on horsepower, amperage, or name plate data only. Motor ata. ocked Rotor Requirements 1. ocked Rotor urrent old: the current which exists the instant the motor is turned on. 2. ocked Rotor urrent Hot: The current level that exists at end of 1st cycle test. Typically 10 to seconds after motor is first turned on. 3. Time elapsed during above test to raise motor winding temperature from room temperature to around maximum allowed temperature for the U class of motor insulation. n example would be, for a class motor, 25º to 175º in 12.5 seconds. 4. mbient Temperature uring test: Room temperature (usually 25º).. Running Overload Requirements 1. oad urrent: With the motor running, the load on the motor is to be increased in small increments until the motor winding has completely stabilized at approximately 10º below the maximum allowed by the U class of the motor. n example would be, for a class motor, the maximum allowed is 1ø. The motor winding temperature was completely stabilized at 1º and the current draw at that time would be recorded. 2&3. Protector ocation Temperatures: These temperatures are taken at the conclusion of the above load current test while the motor is running under the above load. 4. mbient Temperature: Room temperature (usually 25º).. bnormal onditions for Protection. 1. Max/min mbient Temperatures: temperature in the surroundings of protector. 2. Max/min ine Volts: The highest and lowest voltages for which protection should be effective. 3. Other environmental considerations: i.e., exposed to agricultural weather conditions. Name Plate ata. Horsepower. Voltage. Single or three phase. (full load amps). R (locked rotor amps). Insulation class (U/S) (indicate one) Protector Requirements. utomatic or manual reset. Round or eared base. Termination type Motor ata Required. ocked rotor requirements 1. ocked rotor current cold 2. ocked rotor current hot 3. Time required to raise motor winding to max. temperature 4. mbient temperature during test. Running overload requirements 1. oad current required to stabilize main winding temp. at 10º below maximum allowed 2. Protector location temperature below protector surface 3. Protector location temperature above protector (air temp) 4. mbient temp during test. bnormal conditions for protection 1. Max/min ambient temperatures 2. Max/min line volts 3. Other environmental considerations Note: pplication assistance available from Sensata. H.P. Volts Phase H Sec eg eg eg eg eg Volts Printed in U.S.., Reprinted March 2014 Page 5 of 6
xample of Motor Protector Performance urves Ultimate Trip urrent vs Protector mbient Temperature (pproximate, to be used only for selecting samples for motor verification test) verage first ycle Tripping Time vs urrent in 25 mbient (pproximate, to be used only for selecting samples for motor verification test) 150 Ultimate Trip urrent in mperes 20 10 8 6 4 MRT16N MRT16N MRT16N MRT16PN MRT16MN MRT16N MRT16N MRT16N MRT16N MRT16N MRT16HN Short Time urrent in mperes 100 80 60 20 10 8 MRT16N MRT16N MRT16N MRT16N MRT16N MRT16HN MRT16N MRT16N MRT16N MRT16PN MRT16MN 2 50 60 70 80 90 100 110 Temperature in egrees entigrade 6 25 20 15 10 9 8 7 6 5 4 3 2.5 Tripping Time in Seconds Note: Other ratings available for single and three phase applications. omputer software is available to assist in application. Sensata Technologies 529 Pleasant Street ttleboro, M 02703-2964 Phone: 1 (508) 236-3800 mail: klixon@sensata.com Web: www.sensata.com Important Notice: Sensata Technologies (Sensata) reserves the right to make changes to or discontinue any product or service identified in this publication without notice. Sensata advises its customers to obtain the latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current. Sensata assumes no responsibility for infringement of patents or rights of others based on Sensata applications assistance or product specifications since Sensata does not possess full access concerning the use or application of customers products. Sensata also assumes no responsibility for customers product designs. Printed in U.S.., Reprinted March 2014 Page 6 of 6