Page 96 of Contactors and Motor Protection by Moeller Electric USA

emt thermistor protection relays for motors with imbedded p.t.c thermistors moeller s emt thermistor protection relays are specifically designed to monitor positive temperature coefficient ptc thermistors embedded in the motor windings typically used in mission critical applications ptc thermistors coupled with emt thermistor protection relays provide extremely precise thermal feedback and increased motor protection r three designs to choose all emt relays feature automatic reset with power-on and fault-indicating led depending on the model chosen the following additional features are also available · selectable manual or automatic reset · remote reset · short circuit recognition in the sensor circuit · reliable fault signaling even under supply voltage failure zero voltage safety · short circuit recognition and zero-voltage safety can be switched off · test button universal input voltage extremely accurate overload protection moeller emt thermistor protection relays accept voltage inputs of 24 ­ 240v ac 50-60hz and 24 ­ 240v dc making them ideal for the majority of normal control circuit applications universal supply voltage choose from basic to advanced protection zero-voltage safety the emt6-dbk includes fault signaling even with a loss of supply voltage this important safety feature stores the condition of the relay prior to the loss of power when power is restored the relay s output and led fault indication retain state and act accordingly feature comparison led power-on and fault indication thermal overload protection from ptc sensors automatic reset universal control voltage short circuit recognition in the sensor circuit manual or automatic reset remote or local reset test button fault signaling with loss of supply voltage zero-voltage safety short circuit recognition and zero voltage safety can be turned off emt-6 option emt6-db option emt6-dbk

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