High Immunity Type A 4 Pole RCBO – ADR440C
18th Ed. Compliant
2-Year Warranty
UK Stock
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The ADR440C High Immunity Type A 4 Pole RCBO is a 40A protective device designed for three-phase circuits where both AC and smooth DC leakage currents may occur. With 30mA residual current protection, 6mA DC detection, and a 10kA short-circuit rating, it delivers reliable protection for higher load circuits such...
The ADR440C High Immunity Type A 4 Pole RCBO is a 40A protective device designed for three-phase circuits where both AC and smooth DC leakage currents may occur. With 30mA residual current protection, 6mA DC detection, and a 10kA short-circuit rating, it delivers reliable protection for higher load circuits such as EV chargers, heat pump systems, and commercial distribution boards.
Installer Tip: Choose the 40A ADR440C for heavier three-phase circuits or where spare capacity is required. For smaller circuits, see the 32A ADR432C variant.
Key Features
- 40A rated current – suited to higher load three-phase circuits
- Type A sensitivity – detects AC + pulsating DC leakage
- High immunity design – reduces nuisance tripping
- 6mA DC detection – required for EV and inverter-driven systems
- Twin-handle indicator – overload vs leakage fault display
- 10kA short-circuit rating – high-integrity fault protection
- 400V AC, 3P+N – designed for three-phase circuits
Compare High Immunity RCBO Variants
| Model | Rated Current | Poles | Type | Immunity | Breaking Capacity |
|---|---|---|---|---|---|
| ADR432C | 32A | 4 Pole (3P+N) | Type A | High Immunity | 10kA |
| ADR440C (This Product) | 40A | 4 Pole (3P+N) | Type A | High Immunity | 10kA |
When should I use the ADR440C over the ADR432C?
Use the ADR440C when your three-phase circuit requires a 40A rating. For smaller loads, the ADR432C (32A) is more suitable.
Does the ADR440C meet EV installation requirements?
Yes. With 6mA DC detection and full 4-pole disconnection, it is compliant with EV charger regulations under the 18th Edition.
Can this RCBO be used in heat pump or solar installs?
Absolutely. Its high immunity design prevents nuisance trips caused by harmonics or inverter-driven equipment.
Does the twin-handle feature improve fault finding?
Yes. The twin-handle trip indicator allows installers to instantly see whether the trip was due to overload or residual current.
- Product Code: ADR440C-30
- Poles: 4 Pole (3P+N)
- Rated Current: 40A
- Trip Sensitivity: 30mA AC + 6mA DC
- RCD Type: Type A
- Immunity Class: High Immunity
- Short-Circuit Rating: 10kA
- Voltage: 400V AC
- Standards: BS EN 61009-1, BS EN 62423, 18th Edition Compliant
The ADR440C is designed for installation in 4-module DIN rail slots within compatible consumer units or three-phase distribution boards. It provides robust protection for circuits where higher current handling is required alongside DC leakage detection.
- Ideal for use as a main incomer or individual circuit protection
- Recommended for EV chargers, heat pumps, and commercial loads up to 40A
- Confirm circuit design requires 6mA DC detection before use
- Apply manufacturer’s torque settings during installation
- Only install by a qualified electrician
