
MK Sentry H7737M Compact B Curve Type A RCBO DP 30MA 40A 6KA
H7737M
MK Sentry Compact 40A DP B Curve Type A RCBO – Space-Saving Protection with Neutral Switching
The MK Sentry Compact RCBO combines overcurrent and earth fault protection in a single-module design, making it an ideal choice for residential and commercial installations. With neutral switching double pole functionality, this RCBO ensures complete circuit disconnection while offering reliable protection against electrical faults.
- Compact Single-Module Design – Saves space in consumer units while delivering comprehensive protection.
- B Curve Tripping Characteristic – Suitable for general-purpose circuits, offering protection against overloads and short circuits.
- 40A Rated Current – Ensures effective protection for low-power circuits such as lighting and control circuits.
- 6kA Breaking Capacity – Provides fault protection while complying with industry safety standards.
- 30mA RCD Sensitivity – Detects and isolates earth leakage faults, enhancing electrical safety.
- Double Pole (DP) Neutral Switching – Fully disconnects both live and neutral conductors for increased protection.
- Type A RCD Protection – Detects AC and pulsating DC residual currents for improved fault detection.
- Easy Installation – Designed for quick and secure DIN rail mounting in consumer units.
Technical Specification
- Rated Current: 40A
- Breaking Capacity: 6kA
- Tripping Curve: B Curve
- RCD Sensitivity: 30mA
- Type: A
- Number of Poles: Double Pole (DP)
- Mounting: DIN Rail
- Compliance: BS EN 61009
✅ Enhance your electrical safety with the MK Sentry Compact 40A DP B Curve Type A RCBO for space-saving, reliable circuit protection!

Trip Type | B Curve Type A |
Product | RCBO |
Type | Singe Pole Compact |
Current Rating | 40A |
Number Of Poles | Double Pole (2P) |
Delivery Costs
Our standard delivery charge to UK mainland addresses is £5.90 ex-VAT.
Take advantage of FREE* Delivery when you spend over £100 (per order) ex-VAT.
*Delivery charges to JE, GY, TR, BT, IM, IV, HS, KW, ZE and certain PA post codes are £12.00 ex-VAT.
Solar Panels, Batteries and Inverters
Due to their size all solar panels, batteries and inverters orders up to 50 qty will be despatched on a pallet and incur a £120** ex-VAT delivery charge.
**£180 ex VAT to JE, GY, TR, BT, IM, IV, HS, KW, ZE and certain PA post codes.
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