The MK Sentry range of residual current devices (RCDs) includes double‑pole, four‑pole, pulsating DC, fault‑current‑sensitive and time‑delayed models with current ratings from 16 A to 100 A and tripping sensitivities from 10 mA to 300 mA. The devices are offered in two‑module and four‑module configurations for both AC and DC applications.
All devices comply with BS EN 61008:1995 and the 16th edition IEE Wiring Regulations, feature positive contact status indication, and incorporate a filtering device to protect against transient surges. Installation notes cover polarity, test‑button operation, and use as isolating switches when in the OFF position.
| Fault breaking capacity | 3 000 A (up to 10 000 A with BS 88 fuse) |
|---|---|
| Operating frequency | 50 Hz |
| Operating voltages | 2‑pole: 110 V / 230 V; 4‑pole: 230 V‑400 V |
| Ambient temperature (AC) | -5 °C to +60 °C |
All MK Sentry RCDs are designed to fully comply with BS EN 61008:1995 and the 16th edition IEE Wiring Regulations.
The maximum tripping time of a Sentry Time Delayed RCD is 450 ms.
The RCDs have a fault breaking capacity of 3 000 A, which can be increased to 10 000 A when backed up by a BS 88 fuse.