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Thermal Trip (SN-24)




Thermal Trip (SN-24) prevents overload, locked rotor and short circuit. Since the protecting devices are sensitive to both temperature and current they inherently protect against a variety of abnormal conditions while allowing maximum motor output before shutdown. Motor life is extended by limiting the damaging temperatures to a designed level. The SN-24 is basically a bimetallic thermostat with a built–in heating element which is installed in series with the motor winding. The actuating element is a snap–acting thermal disc. The built–in heater simulate winding temperature caused by increase in current. This protector provides crisp, positive switching when the specified trip current is sustained for a specific duration. The device will also actuate when an excessive ambient temperature condition occurs, providing protection against overheat conditions other than overload.

SN-24 motor protector prevents overload, locked rotor and short circuit. Since the protecting devices are sensitive to both temperature and current they inherently protect against a variety of abnormal conditions while allowing maximum motor output before shutdown. Motor life is extended by limiting the damaging temperatures to a designed level. The SN-24 is basically a bimetallic thermostat with a built–in heating element which is installed in series with the motor winding. The actuating element is a snap–acting thermal disc. The built–in heater simulate winding temperature caused by increase in current. This protector provides crisp, positive switching when the specified trip current is sustained for a specific duration. The device will also actuate when an excessive ambient temperature condition occurs, providing protection against overheat conditions other than overload.

Features
  • Single phase protection
  • Locked rotor protection
  • Thermal protection
  • Short circuit protection

Applications
  • 1 phase Motors
  • Air conditioners
  • Refrigerator motors
  • Other home appliances

Rating
  • Rated Voltage Rated Current : 230VAC, 2A to 36A
  • Operating Cycles : 10,000 cycles
  • Maximum Temperature : 160oC
  • Operating Range : 50oC - 160oC
  • Setting Tolerance : +/- 5%
  • Differential : 15-25oC

Selection
  • SN-24/

Graph
The Characteristic graph shows that as there is any over-load, lock-rotor in the motor the SN-24 opens the contact within 4-7 sec. and protects the motor.


Graph

Graph
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