- #1
Farhan Ali
Hello!
I have to use a relay to operate circuit breaker opening/closing coil i.e. 80W @ 110VDC.
Since the breaker is having some mechanical interlocks, so sometimes when the coil is operating, the breaker may not open. In that case the relay contact has to make & break the opening/closing coil supply.
I initially used normal relay for this operation, but later on I observed that relay is not more functional, when I open the relay (i.e. removed its plastic case), I found the plastic base of the relay poles was melted and when the relay was operating, there was some gap between pole and through.
After studying the issue, I came to the conclusion that the DC Inductive Breaking capacity of the relay I were using was 35W Inductive Load i.e. DC12 L/R = 40ms, while the coil rating was 80W.
I search the relays from different vendors, but only 1 relay found suitable for this application, i.e. Arteche CD-2XR relay with high DC Inductive Breaking Capacity.
Apart from this, we can use some other techniques to achieve High Inductive DC Breaking, as mentioned below.
1. Use Two contacts in series
2. Use Diode across the Relay Contact
Is there anyone who has gone through such problem?
Is there any other brand or relay to use for such High DC Inductive Breaking Capacity?
Is there any other technique to handle this issue?
Regards,
Farhan Ali
I have to use a relay to operate circuit breaker opening/closing coil i.e. 80W @ 110VDC.
Since the breaker is having some mechanical interlocks, so sometimes when the coil is operating, the breaker may not open. In that case the relay contact has to make & break the opening/closing coil supply.
I initially used normal relay for this operation, but later on I observed that relay is not more functional, when I open the relay (i.e. removed its plastic case), I found the plastic base of the relay poles was melted and when the relay was operating, there was some gap between pole and through.
After studying the issue, I came to the conclusion that the DC Inductive Breaking capacity of the relay I were using was 35W Inductive Load i.e. DC12 L/R = 40ms, while the coil rating was 80W.
I search the relays from different vendors, but only 1 relay found suitable for this application, i.e. Arteche CD-2XR relay with high DC Inductive Breaking Capacity.
Apart from this, we can use some other techniques to achieve High Inductive DC Breaking, as mentioned below.
1. Use Two contacts in series
2. Use Diode across the Relay Contact
Is there anyone who has gone through such problem?
Is there any other brand or relay to use for such High DC Inductive Breaking Capacity?
Is there any other technique to handle this issue?
Regards,
Farhan Ali