SAST1 | General Electric Shunt Trip Circuit Breaker

The SAST1 is a remote shunt trip accessory designed for General Electric's Spectra RMS circuit breakers, specifically applicable to models ranging from SE150 to SK1200, including Mag-Break motor circuit protectors and molded case switches. These accessories are UL listed and can be installed internally without requiring cover removal. The shunt trip mechanism enables remote tripping of the circuit breaker when triggered by a momentary close contact signal. 

It's important to note that continuous energization with a latching relay contact is not recommended due to potential pulsing of power to the coil, which can cause delayed shunt tripping upon reclosure, typically within 1-2 seconds at the rated control voltage. Instantaneous tripping, however, occurs during a short circuit fault. For applications where delayed shunt tripping is unacceptable with a latching relay contact, alternatives include using a bell alarm in conjunction with control power for SE150 and SF250 frames, or employing an auxiliary switch for SG600 and SK1200 breakers. 

Key specifications of the SAST1 include a maximum power rating of 75 VA, compatibility with AC voltage at 120 V and DC voltage at 125 V, and operation within a frequency range of 50-60 Hz. It is designed for left pole mounting on SE150/SF250 frame circuit breakers within the Spectra RMS series. The SAST1 is a field-installed accessory that conforms to the authentic standards of General Electric products.