Slim Innovative Self Power Protection Relay for RMUs with Horizontal & Vertical Mounting Options : CSPR-V5 (H&V)

FEATURES

Relay gets energised either from Current, Aux. voltage, front USB or internal battery (whichever is available)

  • DEFT and Inverse characteristics for O/C and E/F are individually selected for phase and earth fault
  • O/C, S/C, E/F and E/F High set protection
  • Circuit breaker failure protection (50BF)
  • Cold load pickup protection
  • Unbalance / Asymmetric protection
  • Potential pulse output for direct triggering of the circuit breaker coil.
  • Two sets of setting groups
  • Two Potential Relay Output Contacts
  • Remote Trip DI
  • Last 5 Fault & 10 Event records with Time stamp
  • Wide operating ranges of the auxiliary supply voltage (AC/DC)
  • USB port for PC / Laptop interface

CSPR is a numeric, multi-function over-current relay engineered for ring-main units and feeder protection. Integrating several protection tasks in a single compact device, it delivers high-performance, cost-optimised protection for medium-voltage switchboards—often eliminating the need for a separate load-break switch.

  • Relay draws its operating energy directly from the current transformers (CTs) in the protected circuit, ensuring continuous operation even during a main power outage or auxiliary supply failure.
  • It can also be energised from an auxiliary voltage supply (AC/DC), an internal battery, or a front USB port (for configuration), providing flexibility during commissioning and maintenance.
  • The device is designed to store enough energy to trip the circuit breaker even with low current faults
  • It integrates various protections in a single compact unit, including:
    • Over current
    • Short circuit
    • Earth fault
    • Earth fault High set
    • Under current
    • Cold load pickup
    • Inrush blocking
    • Unbalance / Asymmetric
    • Circuit breaker failure
    • Trip circuit supervision
  • The relay stores the last several fault and event records with a date and time stamp.
  • Its small and compact design facilitates integration into Ring Main Units and other space-constrained switchboards.
  • Features an RS-485 Modbus communication port (rear) and a front USB port for PC/laptop interfacing, enabling remote monitoring, control, and easy configuration using software like CSE LIVELINK.
  • An LCD display and push buttons allow for easy viewing of measured parameters, fault data, and setting adjustments.