Live Electrical AMR B-030 Type A Single Module Various Amps B Curve 30mA RCBO
Live Electrical AMR B-030 Type A Single Module Various Amps B Curve 30mA RCBO - AMR106B-030- 6 amp in stock is backordered and will ship as soon as it is back in stock.
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Type A
Detects sinusoidal AC and pulsating DC faults. Required for EV chargers, PV and VFDs.
Single Module
MCB-sized. Saves DIN rail space vs 2-module devices. Six amperage options in one range.
6kA Breaking
6kA breaking capacity at 230V AC. Switched neutral as standard.
BS EN 61009-1
Certified to the UK standard. 4,000 electrical cycles, 100,000 mechanical cycles.
Type A RCBO
What This RCBO Is and Why Type A Matters
The Live Electrical AMR B-030 is a Type A single module RCBO available in six amperage ratings: 6A, 10A, 16A, 20A, 32A and 40A. At £8.19 + VAT it is priced for trade volume use. All amperages share the same specification: B Curve, 30mA residual current, 6kA breaking capacity, 230V AC, BS EN 61009-1 certified and switched neutral as standard.
The Type A classification is the key differentiator from standard Type AC RCBOs. A Type AC RCBO detects sinusoidal AC residual currents only. A Type A RCBO detects both sinusoidal AC residual currents and pulsating DC residual currents. Modern electronic loads including EV chargers, solar PV inverters, variable frequency drives and LED drivers can produce pulsating DC fault currents that a Type AC device may not detect reliably. The 18th Edition IET Wiring Regulations (Amendment 2, BS 7671:2018+A2:2022) require Type A protection for circuits supplying such equipment. Using this RCBO on these circuits satisfies that requirement in a single module width.
Switched neutral as standard means both line and neutral conductors are switched simultaneously when the device trips. This guarantees that a faulted circuit is fully isolated and that healthy circuits remain unaffected. On high-integrity installations this is the specified configuration.
Applications
Where Type A RCBOs Are Required and Which Amperage to Choose
Type A is specified wherever a circuit may supply equipment with pulsating DC components. B Curve suits most resistive and lightly inductive domestic and commercial circuits.
Circuits where Type A RCBO is required
- EV charger circuits (Amendment 2, BS 7671)
- Solar PV inverter output circuits
- Variable frequency drive (VFD) circuits
- LED driver circuits with switch-mode power supplies
- IT and data equipment circuits
- Any circuit with rectifier or inverter loads
- Circuits where Type A is specified on the design
- Upgrade of existing Type AC installation to current regulations
Amperage selection guide
6A (AMR106B-030)
Lighting circuits (new build or refurb), secondary lighting circuits, low-load dedicated circuits.
10A (AMR110B-030)
Lighting circuits, some small appliance circuits. Where diversity reduces design current below 16A.
16A (AMR116B-030)
Ring main and radial socket circuits, smaller dedicated appliance circuits, some EV charger types.
20A (AMR120B-030)
Dedicated radial socket circuits, some cooker and shower circuits where design current warrants 20A protection.
32A (AMR132B-030)
Ring main protection, 7kW EV charger circuits, cooker circuits, high-load socket circuits.
40A (AMR140B-030)
Higher-load circuits, some shower circuits, circuits approaching the upper rating of the range.
Always size the RCBO to the design current of the circuit after applying diversity, not to the maximum connected load. Cable rating and the upstream protective device must also be considered. Where in doubt, consult the IET Wiring Regulations (BS 7671) or a qualified electrical designer.
Protection Device Guide
RCBO vs MCB vs RCD: What Goes Where
Understanding when a Type A RCBO is the right device - and when a different device is appropriate.
| Device | Overcurrent protection | Earth fault protection | Fault types detected | DIN rail modules | Typical use |
|---|---|---|---|---|---|
| MCB only | Yes | No | Overcurrent and short circuit | 1 | Circuits not requiring RCD protection; upstream of separate RCD |
| MCB + Type AC RCD | Yes (MCB) | Yes (AC only) | Overcurrent + sinusoidal AC fault | 2+ | General domestic circuits not supplying electronic loads; not suitable for EV chargers |
| Type AC RCBO | Yes | Yes (AC only) | Overcurrent + sinusoidal AC fault | 1 | General circuits without electronic loads; per-circuit protection without pulsating DC risk |
| Type A RCBO (this product) | Yes | Yes (AC + pulsating DC) | Overcurrent + sinusoidal AC + pulsating DC faults | 1 | EV chargers, PV inverters, VFDs, electronic loads, any circuit requiring Amendment 2 compliance |
Per-circuit protection: why RCBO beats MCB + RCD
Where a consumer unit uses a single RCD covering multiple circuits, a fault on any one circuit trips the RCD and takes down all circuits downstream of it - including circuits with no fault. An RCBO on each circuit means only the faulted circuit trips. Essential in high-integrity installations, mandatory in high-risk locations and increasingly standard practice on new domestic work. The single module width of the Live Electrical AMR B-030 means no additional DIN rail space over a conventional MCB.
Technical Specifications
Live Electrical AMR B-030 Full Specification
| Range | Live Electrical AMR B-030 |
| Type | Type A RCBO - single module |
| Amperages available | 6A, 10A, 16A, 20A, 32A, 40A |
| Part numbers | AMR106B-030 / AMR110B-030 / AMR116B-030 / AMR120B-030 / AMR132B-030 / AMR140B-030 |
| Rated voltage (Ue) | 230V AC, 50/60Hz |
| Breaking capacity (Icn) | 6kA |
| Residual current | 30mA |
| Residual current type | Type A (sinusoidal AC and pulsating DC) |
| Tripping characteristic | B Curve (3-5 x In) |
| Neutral switching | Switched neutral as standard |
| DIN rail width | Single module (MCB-sized) |
| Electrical endurance | 4,000 cycles |
| Mechanical endurance | 100,000 cycles |
| Standard | BS EN 61009-1 |
| Protection class | Overload, short circuit, earth fault, fire hazard from insulation faults |
| Trade price at Harbro | £7.95 + VAT (£9.54 inc.) per RCBO |
Frequently Asked
Type A RCBO: Common Questions
What is a Type A RCBO?
A Type A RCBO is a residual current breaker with overcurrent protection that detects both sinusoidal AC earth fault currents and pulsating DC earth fault currents. A standard Type AC RCBO only detects sinusoidal AC faults. Modern electronic loads including EV chargers, solar PV inverters, variable frequency drives and LED drivers can produce pulsating DC fault currents. The 18th Edition IET Wiring Regulations (BS 7671, Amendment 2) require Type A protection for circuits supplying such equipment. The Live Electrical AMR B-030 is a Type A single module RCBO available in 6A to 40A from Harbro Electrical, Peterlee.
What is the difference between Type A and Type AC?
Type AC detects sinusoidal AC residual currents only. Type A detects sinusoidal AC residual currents and pulsating DC residual currents. This difference is commercially important because circuits supplying EV chargers, PV inverters, VFDs and most modern electronic equipment can generate pulsating DC fault currents during an earth fault. A Type AC RCBO may not respond quickly enough to these fault types, leaving the circuit without adequate protection. Where the design specifies Type A, or where an EV charger or PV system is being installed, a Type A device is required.
What is the difference between an RCBO and an MCB with a separate RCD?
An MCB provides overcurrent and short circuit protection only. An RCD provides earth fault protection only. An RCBO combines both in a single module. The key practical advantage of an RCBO over MCB + RCD is per-circuit protection: when a single circuit has an earth fault, only that circuit's RCBO trips. If circuits share a single RCD, any fault on any downstream circuit trips the RCD and removes all circuits it covers. RCBO boards are increasingly standard on new domestic installations for this reason. The Live Electrical AMR B-030 takes the same single module width as a standard MCB, so there is no DIN rail penalty.
Which amperage RCBO do I need?
Size the RCBO to the design current of the circuit after applying diversity, within the rating of the cable. Common selections: 6A or 10A for lighting circuits; 16A for ring main sockets and smaller radial circuits; 32A for ring mains, 7kW EV charger circuits and cooker circuits; 40A for higher-load circuits. The Live Electrical AMR B-030 covers 6A (AMR106B-030), 10A (AMR110B-030), 16A (AMR116B-030), 20A (AMR120B-030), 32A (AMR132B-030) and 40A (AMR140B-030) - all available from the same product listing at Harbro.
What does B Curve mean on an RCBO?
B Curve is the instantaneous magnetic trip characteristic. A B Curve RCBO trips instantaneously on short circuit at 3 to 5 times the rated current. This suits most domestic and light commercial circuits with resistive and lightly inductive loads - lighting, socket outlets, general appliances. C Curve (5 to 10 times rated current) is used for circuits with higher inrush currents such as motors, transformers and some commercial equipment. Where the design calls for a B Curve Type A RCBO, the Live Electrical AMR B-030 is the correct device.
What does 30mA mean on an RCBO?
30mA is the rated residual operating current - the earth fault current at which the device will trip to protect against electric shock. BS 7671 requires 30mA RCD protection for socket outlet circuits (where sockets are likely to be used with equipment outdoors), circuits in bathrooms and shower rooms, circuits in high-risk locations, and circuits supplying EV chargers. A 30mA device will trip within 40 milliseconds at 30mA and within 300 milliseconds at 15mA, providing effective protection against indirect contact with live conductors.
Does a Type A RCBO need to be fitted by an electrician?
Yes. Installation involves working inside a consumer unit or distribution board, which is work on or near live conductors and is notifiable under Part P of the Building Regulations in England and Wales. It must be carried out by a qualified electrician registered with a competent person scheme (such as NICEIC, NAPIT or ELECSA), or notified to the local building control authority. This is a trade product supplied to qualified electricians and contractors. It is not a consumer product.
Where can I buy Type A RCBOs in the North East?
Live Electrical Type A single module RCBOs in 6A, 10A, 16A, 20A, 32A and 40A are stocked at Harbro Electrical, 5 & 6 Whitworth Road, Peterlee, Co Durham, SR8 2LY. Mon to Thu 7:30am to 5:00pm, Fri 7:30am to 4:00pm, Sat 8:30am to 12:30pm. Call 0191 518 1998 to check current stock. We supply electrical contractors across Peterlee, Hartlepool, Sunderland, Durham and Seaham. Free UK Mainland delivery on orders over £70.
Live Electrical and FuseBox at Harbro
