Harmann - automation - circuit breaker with thermal protection STDT

Thermal protection relay for three-phase three-phase 400 V motor with a fan in, having a thermocontact tip (marked TK, TW, TB, TP, PTO) outside the motor housing (box or fan connection cable).

Technical data

• switch with thermal protection
• thermal overcurrent limiter
• electromagnetic short-circuit relay to protect the line
• rated supply voltage 3 ~ 400 V
• protection degree IP20 (DIN rail mounting, E models)
• degree of protection IP54 (surface mounting, models 16 and 25)
• maximum working temperature 40 C (55 C for E models)

The relay will be disconnected in the event of motor overheating (winding temperature sensor in the motor open), maximum current of the power supply line exceeded, short circuit in the line connected to the relay. Loss of supply voltage does not disconnect the relay.

Optional equipment is an auxiliary contact ZB (1NO + 1NC) and block against unauthorized start.