MK Electric Sentry RCD - 100A 30MA 230V DP Type A 2 Module
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Product Information
Full details
This MK Electric Sentry RCD is designed for electricians and homeowners needing reliable protection against earth faults. Its key benefit is providing robust safety with a 100A current rating and 30mA sensitivity. A potential caveat is that Type A protection is specific and may not cover all fault types encountered in very complex industrial settings.
All features
| Series | Sentry |
|---|---|
| Model Part Number | Sentry RCD 100A 30MA 230V DP Type A 2 Module |
| Brand | MK Electric |
Extended Product Information
FAQs
What is the difference between Type A and Type AC RCDs?
Type AC RCDs detect sinusoidal AC earth leakage currents. Type A RCDs offer enhanced protection by detecting both sinusoidal AC and pulsating DC earth leakage currents, making them more versatile for modern installations with electronic equipment.
Does this RCD provide overload protection?
No, this RCD is a Residual Current Device (RCD) which protects against earth leakage faults. It does not protect against overcurrents or short circuits. These protections are typically provided by a Miniature Circuit Breaker (MCB) used in conjunction with the RCD.
Can I use this RCD for a 3-phase supply?
No, this is a 230V, 2-pole (single-phase) RCD and is not suitable for 3-phase applications.
How often should I test the RCD?
It is recommended to test the RCD using its test button at least every six months to ensure its continued safe operation.
What does 'DP' stand for?
DP stands for Double Pole, meaning the RCD switches both the live and neutral conductors simultaneously.
What does '2 Module' mean?
It refers to the width of the RCD, typically meaning it occupies two standard 18mm spaces on a DIN rail.
Troubleshooting
RCD trips frequently without apparent cause
Check for faulty appliances connected to the protected circuit. Perform a test with all appliances switched off. If it still trips, the RCD itself may need checking by a qualified electrician.
RCD does not trip when the test button is pressed
Ensure the incoming supply is live. If the supply is correct, the RCD may be faulty and requires replacement by a qualified electrician.
Device hums or vibrates
This can sometimes indicate a slight imbalance in the load current or internal component resonance. While often harmless, if accompanied by heat or tripping, it warrants inspection by a qualified electrician.
Pros and Cons
Pros
- Provides essential safety by detecting earth leakage currents.
- Suitable for a wide range of domestic and commercial applications.
- Type A protection offers better performance against certain fault types than Type AC.
- Double pole switching ensures complete isolation of circuits.
- Compact 2-module design saves space in distribution boards.
Cons
- Type A RCD may not be sufficient for installations with significant smoothed DC leakage (Type B required).
- Requires careful wiring of both live and neutral conductors.
- Not a circuit breaker; does not offer overload or short-circuit protection on its own.
Setup, Compatibility & Care
Setup:
This RCD is designed for mounting on a standard DIN rail within an electrical enclosure. Ensure the power supply to the enclosure is isolated before commencing installation. The device is double pole, meaning both the live and neutral conductors from the incoming supply must be connected to the respective terminals, and the outgoing circuit conductors connected to the load terminals. The neutral terminal is located on the left.
Compatibility:
- Compatible with standard UK single-phase 230V electrical systems.
- Designed to work with MCBs (Miniature Circuit Breakers) for combined overcurrent and earth leakage protection. The RCD itself does not provide overload or short-circuit protection.
- Suitable for installations requiring compliance with the 18th Edition of the IET Wiring Regulations.
Care:
- Regularly test the RCD using its built-in test button to ensure it is functioning correctly.
- Keep the electrical enclosure clean and free from dust and moisture.
- No user-serviceable parts inside; rely on qualified electricians for any maintenance.