Switch / circuit breaker that opens and remains open during loss of power

[Benihana]

I am working on a project that requires a set of modules of a chiller to be de-energized during a loss of power and remain OFF until it is manually reset. Does anybody know what I could use to accomplish this? (note this set of modules will have it's own source of power)

 

[infinity]

Is there alternate power available during the power failure to operate something like a shunt trip breaker?

 

[Benihana]

Is there alternate power available during the power failure to operate something like a shunt trip breaker?

Yes, I'd have availability to power some type of relay from a separate source.

 

[wwhitney]

I am working on a project that requires a set of modules of a chiller to be de-energized during a loss of power and remain OFF until it is manually reset. Does anybody know what I could use to accomplish this?

In the context of power tools like a table saw, the most common option is known as a magnetic switch, e.g. to pick one arbitrarily:

Magnetic Switch, Single-Phase, 220V Only, 3 HP, 21-25A - Grizzly Industrial

These professional grade magnetic switches protect against thermal overload and automatically shut down if power is interrupted, so equipment won’t start when circuits are turned back on. Single-phase, 220V only. 3 HP, 21-25 amp.

www.grizzly.com

Cheers, Wayne

 

[infinity]

Yes, I'd have availability to power some type of relay from a separate source.

What size load are you looking at? For a very large load you might need something like a mechanically held latching relay.

 

[don_resqcapt19]

Yes, I'd have availability to power some type of relay from a separate source.

Then you could use a breaker with the under voltage release option.

 

[d0nut]

If you go with an undervoltage release, you may want to see if you can get some capacitors or other energy storage system to carry through small power disruptions rather than outages. Otherwise you may find the undervoltage option creates a bunch of annoyance with breakers operating on less significant power quality issues.

 

[garbo]

Cheapest way that I came across was they used a cheap ice cube relay that the two of the phases feed the relay coil ( supply & relay coil were 240 VAC ) . They installed a NO pushbutton marked start to energise the relay coil. The NO relay contact was the first set of contacts after the control transformer fuse. Years ago place that I worked at had start stop buttons on 8 ammonia refrigeration compressors that would drop out when the tie breaker closed to feed plant from one 13.2 KV services. They had us replace start stop buttons with a toggle switch. Several times the automatic tie breaker did not transfer power and on weekends huge chill box temperatures will rise. Then if one of the sparkies transferred power to the working incoming service at least 5 or 6 compressor motors started at the same time tripping out a feeder breaker so we had to start compressors up one at a time over a few minutes.