1. Product Model

2. Brand

3. Product Category

4. Alias

• Official：S‑2 Relay Board

• Common：Drive Relay Control Card, System Interface Relay PCB, S‑2 Drive Auxiliary Relay Module, DC Drive I/O Relay Board

5. Basic Information

• Manufacturer：Reliance Electric, USA

• Structure：19” rack‑mount plug‑in card, long‑edge backplane connector, front‑mounted relay bank

• Status：Obsolete / Discontinued（legacy maintenance spare part for S‑2 drives）

• Dimensions：Approx. 4” × 5”（102 mm × 127 mm）

• Features：Integrated power relays, fuse protection, LED status indicators, terminal blocks for external I/O, surge suppression circuits

• Revision Note：‑1 denotes upgraded relay contacts, improved coil insulation, and enhanced noise filtering vs. base 0-52002

6. Function & Positioning

• Core Function：Relay-based I/O interface and auxiliary control for Reliance S‑2 series industrial DC drives；routes +24 VDC control signals to external relays, contactors, and interlocks；provides fault relay outputs（overvoltage/overcurrent/overtemperature）and status relay outputs（drive ready, run, fault）；isolates high‑power control circuits from low‑voltage logic；enables external emergency stop, interlock, and remote control functions.

• Positioning：I/O relay hub for S‑2 DC drive systems；works with 0-52001 (main control board)、0-51901‑A (armature regulator)、0-51902‑5A (speed feedback)、0-51903‑A (auxiliary power) to form a complete high‑performance DC speed control system.

7. Core Performance Parameters

• Input：+24 VDC (control) from auxiliary power board, 115/230 VAC (relay coils)

• Relay Ratings：

  • Contact Rating：5 A @ 250 VAC / 30 VDC

  • Coil Voltage：24 VDC / 115 VAC（jumper selectable）

• Isolation：2500 Vrms between logic and relay circuits

• Operating Temp：0°C ~ +55°C

• Storage Temp：-40°C ~ +85°C

• Protections：Input fuses, relay coil suppression, contact arc suppression, transient voltage protection

8. General Matching Accessories

• Main control board：0-52001

• Armature regulator board：0-51901‑A

• Speed feedback board：0-51902‑5A

• Auxiliary power supply board：0-51903‑A

• Field controller board, shielded I/O cables, rack mounting hardware, external interlock relays

9. Applicable Equipment & Industry

• Equipment：Reliance S‑2 series industrial DC drives, Minipak/MaxPak/PRL series DC drive systems, heavy‑duty spindle drives, coil winders, industrial cranes

• Industries：Metallurgical rolling mills, papermaking machines, mining conveyors, heavy machine tools, textile lines, printing presses, industrial constant‑torque speed regulation systems, material handling equipment