ABB REM615J Relion 615 Series Motor Protection and Control Relay

Configured for asynchronous motor protection, control, and thermal overload supervision in medium-voltage industrial power systems, the ABB REM615J (REM615 Motor Protection and Control Relay) provides direct physical/electrical execution. The withdrawable plug-in unit converts phase current and voltage transformer inputs into digital protection decisions, actuating circuit-breaker trip contacts and streaming electrical measurements over substation network buses.

Suffix Breakdown & Model Matrix

Hardware Specifications

Backplane Bus Communication and Firmware Flash Protocols

The relay interfaces with industrial automation control structures through standard communication adapters mounted directly to the internal backplane architecture. High-speed backplane bus communication velocity enables rapid data transfer between signal processor cards and network interfaces, supporting deterministic IEC 61850 GOOSE messaging with latency under 10 ms. Operating system updates and functional scheme adjustments execute through the front optical interface or rear Ethernet port using ABB PCM600 software, verifying firmware flash compatibility before rewriting non-volatile internal flash memory.

Frequently Asked Questions

Q: What precautions are necessary when hot-swapping the withdrawable plug-in unit?

A: Although the casing includes automatic short-circuiting mechanisms for current transformer (CT) secondary loops, technicians must isolate auxiliary DC supply power and trip output contacts prior to physical extraction to prevent accidental circuit breaker actuation.

Q: How does the unit process thermal memory after an unexpected loss of auxiliary power?

A: Thermal overload models retain the calculated thermal stress state in non-volatile memory. Upon power restoration, the firmware restores the pre-fault thermal image value to prevent premature motor restarts before adequate stator cooling occurs.

Field Installation Guidelines

Mount the withdrawable case vertically into a cut-out on the switchgear panel door using standard mounting brackets. Ensure at least 50 mm of vertical clearance above and below the enclosure to facilitate heat sink thermal dissipation.

Establish a single-point protective earth connection by connecting a dedicated stranded copper cable (minimum 4.0 mm2 cross-section) from the rear earth terminal directly to the panel grounding bar. Route low-voltage signal, binary input, and communication wiring in separate metallic conduits, maintaining distance from high-current motor leads. Ensure Ethernet cable metallic braid shields ground at the cabinet entry point to suppress ambient electromagnetic interference. Maintain a minimum engagement of 5 full threads when torquing enclosure grounding screws to 1.2 N-m.