3 Phase PME Fault Detection Unit 40R (WARB5100C/PME40R)
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
Secure Payments With
Pre-wired in the UK and built to order – allow up to 3 working days for dispatch. The WARB5100C/PME40R is a 3 Phase PME Fault Detection Unit with integrated 40A Type A RCBO. It combines a 100A MCB main switch, PME relay, and RCBO to deliver full PEN-loss protection plus...
Pre-wired in the UK and built to order – allow up to 3 working days for dispatch.
The WARB5100C/PME40R is a 3 Phase PME Fault Detection Unit with integrated 40A Type A RCBO. It combines a 100A MCB main switch, PME relay, and RCBO to deliver full PEN-loss protection plus overload and residual current protection for downstream circuits. Built for EV charging hubs, solar installs, and 3-phase commercial supplies, it ensures a safe and regulation-compliant setup without the need for an earth rod.
The PME relay continuously monitors supply voltages across all three phases (400V / 415V). If undervoltage is detected (below 207V), the unit disconnects automatically and resets once stable. If overvoltage is detected (above 253V), it isolates and requires a manual reset via the red button. This ensures safe fault management under BS7671:2018+A2:2022.
Installer Tip: Choose the 40R variant when you need combined overcurrent and residual current protection alongside PME monitoring. For sites also requiring surge protection, see the 40RSP model.
Key Features
- PME Fault Protection: Isolates all poles and earth on PEN loss
- 100A MCB Main Switch: Provides upstream isolation
- 40A Type A RCBO: Adds overload + residual current protection
- Automatic Monitoring: Detects undervoltage & overvoltage across phases
- Reset Functions: Auto reset on undervoltage recovery; manual reset for overvoltage
- Compliance: BS7671:2018+A2:2022 PME requirements met
- Applications: EV chargers, solar PV installs, and commercial 3-phase sites
Variant Comparison
| Model | Configuration | Best Use Case |
|---|---|---|
| WARB5100C/PME | 100A MCB + PME Relay | Base option for PME detection only |
| WARB5100C/PMESP | 100A MCB + PME Relay + SPD | Adds surge protection for EV & solar sites |
| WARB5100C/PME40R (This Product) | 100A MCB + PME Relay + 40A RCBO | Adds overload + residual protection |
| WARB5100C/PME40RSP | 100A MCB + PME Relay + 40A RCBO + SPD | Full coverage with surge + RCBO protection |
| WARB5100C/PME63DRSP | 100A MCB + PME Relay + 63A RCBO + SPD | Higher load three-phase installs with full protection |
What does the RCBO add to this unit?
The factory-fitted 40A RCBO adds both overload and residual current protection, providing extra safety compared to the base or SPD-only models.
Do I still need an earth rod?
No. The PME relay removes the need for an earth rod, ensuring faster and compliant installs.
Can this unit be used with EV chargers?
Yes – it’s compatible with most 3-phase EV chargers, including Tesla Wall Connectors, especially where built-in PME protection is absent.
What’s the difference between this and the 40RSP?
The 40RSP model includes the same RCBO plus a Type 2 SPD for surge protection. Choose based on site risk and compliance needs.
Is this compliant with BS7671?
Yes – it fully complies with BS7671:2018+A2:2022, including PME requirements.
| Product Code | WARB5100C/PME40R |
| Rated Voltage | 400V / 415V (3 Phase) |
| Voltage Monitoring Range | 207V – 253V per phase |
| Main Switch | 100A Curve C MCB (5-pole) |
| RCBO | 40A Type A RCBO |
| Frequency | 50Hz |
| Ingress Rating | IP40 (indoor use) |
| Reset Functions | Auto reset (undervoltage), Manual reset (overvoltage) |
| Standards | BS EN 61439-3, BS7671:2018+A2:2022 |
| Build Time | 3 working days from order |
This PME fault detection unit with RCBO is supplied pre-wired, labelled, and ready for connection. Installation must be carried out by a qualified electrician in accordance with BS7671:2018+A2:2022.
- Isolate mains before installation
- Fit with correct gland fittings and torque (2.5Nm)
- Test PME relay and RCBO operation during commissioning
- Install indoors in a ventilated location (IP40 rated)
