ABB – CBS‑4C – 3‑Module DIN‑Rail, 4‑Channel Type A Earth-Leakage Relay Station

The CBS‑4C is a compact, DIN‑rail mountable earth-leakage relay station that combines four independent Type A leakage protection channels, each with adjustable sensitivity and delay, plus a pre-alarm output. Featuring RS‑485 Modbus RTU, it allows centralized monitoring, configuration, and remote reset. Ideal for industrial or commercial switchpanels requiring multi-point protection.

 Key Specifications

• Model: CBS‑4C – 4 programmable earth‑leakage relays + pre‑alarm; RS‑485 Modbus RTU enabled  

• Channels: 4 independent leakage trip relays + 1 pre-alarm relay; each channel triggers breakers via external CTs (Circutor WGC/WGS)  

• Sensitivity: Adjustable from 30 mA up to 30 A, with high-frequency filtering and inverse-time curve compliance  

• Timing: User-configurable delays between 0.02 s and 10 s (plus instantaneous option)  

• Display & Buttons: Backlit LCD (green normal, red on trip), 2 status LEDs, 7 programming keys  

• Communication: RS‑485 Modbus RTU; remote trip/reset supported via comms  

• External Trip/Reset Input: Voltage-triggered input for external devices (e.g. 230 V trip/reset)  

• Mounting & Size: 3-DIN modular width, DIN‑rail EN 50022; optional panel adapter available