LV Breaker "Current Sensors"
LV Breaker "Current Sensors"
(OP)
Hi everyone,
I have searched this topic far and wide and have been unfortunately unable to acquire it, even directly from the manufacturer:
Does anyone happen to know the technical specs (ratio, excitation, burden, voltage rating, etc.) of the "current sensors" which are used for the electronic trip units on low voltage power breakers or MCCBs?
I know that they take a voltage signal from the sensors, and some of the secondary current is used to power the trip unit itself (I've seen between 18% up to 35% load current required to power the unit). However, that is as far as I can get. With respect to any other info on the "current sensor" / fake current transformer, I'm at a loss.
Thanks.
I have searched this topic far and wide and have been unfortunately unable to acquire it, even directly from the manufacturer:
Does anyone happen to know the technical specs (ratio, excitation, burden, voltage rating, etc.) of the "current sensors" which are used for the electronic trip units on low voltage power breakers or MCCBs?
I know that they take a voltage signal from the sensors, and some of the secondary current is used to power the trip unit itself (I've seen between 18% up to 35% load current required to power the unit). However, that is as far as I can get. With respect to any other info on the "current sensor" / fake current transformer, I'm at a loss.
Thanks.






RE: LV Breaker "Current Sensors"
First one I looked at (ABB MB) has ratios of xxxx:2A 600V 10kV BIL 1.06 ohm burden @12x
RE: LV Breaker "Current Sensors"
I'm looking for info on commonly used breakers: Magnum DS, Masterpact NW, Sentron WL, etc.
Thank you
RE: LV Breaker "Current Sensors"
RE: LV Breaker "Current Sensors"
RE: LV Breaker "Current Sensors"
The instant trip function remains magnetic so the trip unit can operate from a no load initial condition. From an initial no load condition the inverse time function can have a slight delay as the trip unit "boots" from its unpowered state.
RE: LV Breaker "Current Sensors"
RE: LV Breaker "Current Sensors"
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington