2C80 CB Fail Relay

The 2C80 Series relays are adjustable AC current sensing relays for application in breaker fail protection schemes.

The main differentiating feature of the 2C80 over the 2C65 model is that is has a zero DC burden until an external initiate signal is applied. The DC power supply is specially designed for very fast start up so that <20ms instantaneous operate time is achieved. per phase basis.

The 2C80 current check relay detects the circuit breaker failure to trip & to ensure discrimination has a fast reset time & minimum overshoot time. Each current level detector initiates a time delay, set by the user, which delays operation of the output contacts. Definite time overcurrent relays offer advantages over inverse time protection in power systems which have a wide variation in source impedance. Faults can be cleared in relatively short times irrespective of the magnitude of the fault current, & coordination of several relays in a system can be obtained at all times regardless of fault current variation.

Features

• Single or double shot reclose with selectable auto reset mode
• 10:1 PU setting ranges
• 5 - 50% or 20 - 200% of nominal input current
• 1A or 5A nominal CT's
• Fast operate time <20ms at 2x setting
• Fast reset time     <15ms at 2x setting
• Zero DC auxiliary burden until external initiate signal applied
• 3 x Single phase initiate inputs
• 1 x Three phase initiate input
• 2 N/O output contacts per phase with selectable time delay / instantaneous configuration possible
• External timer initiate output or internal timer initiate input
• Very low AC burden
• 0-510ms delay in 2ms steps & 0-2,040ms delay in 8ms steps
• Optional magnetic flag trip indication with remote reset
• Range of auxiliary supplies
• Size 4M draw out case
• Made in Australia