3 Phase PME Fault Detection Unit SP (WARB5100C/PMESP)
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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Pre-wired in the UK and built to order – allow up to 3 working days for dispatch. The WARB5100C/PMESP is a 3 Phase PME Fault Detection Unit with integrated Type 2 surge protection. It combines a 100A MCB main switch, PME relay, and SPD 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/PMESP is a 3 Phase PME Fault Detection Unit with integrated Type 2 surge protection. It combines a 100A MCB main switch, PME relay, and SPD to deliver full PEN-loss protection plus transient surge suppression. Ideal for EV charging hubs, solar PV systems, and commercial 3-phase sites, it ensures safe, regulation-compliant installs 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), the unit isolates and requires a manual reset via the red button. Surge protection status is indicated via a clear visual display (Green = OK, Red = Replace).
Installer Tip: Always consider surge protection where sensitive electronics or EV chargers are present. This variant saves space by combining PME monitoring with a factory-fitted SPD.
Key Features
- PME Fault Protection: Isolates all poles and earth on PEN loss
- 100A MCB Main Switch: Overcurrent protection with clear isolation
- Type 2 SPD: Built-in surge protection with visual status indicator
- Automatic Monitoring: Detects undervoltage & overvoltage across all phases
- Reset Functions: Auto reset on undervoltage recovery; manual reset for overvoltage
- Compliance: Meets BS7671:2018+A2:2022 for PME & surge protection
- Applications: EV hubs, solar PV systems, and commercial 3-phase supplies
Variant Comparison
| Model | Configuration | Best Use Case |
|---|---|---|
| WARB5100C/PME | 100A MCB + PME Relay | Base option for PME detection only |
| WARB5100C/PMESP (This Product) | 100A MCB + PME Relay + Type 2 SPD | Adds surge protection for EV & solar sites |
| WARB5100C/PME40R | 100A MCB + PME Relay + 40A RCBO | Adds overload & residual current 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 makes this version different?
It includes a factory-fitted Type 2 SPD in addition to the 100A MCB and PME relay, providing transient surge protection for sensitive EV and renewable equipment.
How does the SPD indicate its status?
The SPD has a visual window: Green = Operational, Red = Replace. This provides clear on-site maintenance cues.
Can this unit replace a standard 3-phase distribution board?
Yes – it combines PME protection with surge suppression, making it a safer alternative to standard 3-phase boards for EV, solar, or commercial installs.
Do I still need an earth rod with this unit?
No. The PME relay eliminates the requirement for a ground rod, while the SPD adds surge protection, ensuring faster and compliant installs.
Is this model compliant with BS7671?
Yes – it fully complies with BS7671:2018+A2:2022, including PME protection and surge protection requirements.
| Product Code | WARB5100C/PMESP |
| Rated Voltage | 400V / 415V (3 Phase) |
| Voltage Monitoring Range | 207V – 253V per phase |
| Main Switch | 100A Curve C MCB (5-pole) |
| Surge Protection | Type 2 SPD with visual status (Green = OK, Red = Replace) |
| 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 SPD is supplied pre-wired, labelled, and ready for connection, but must only be installed by a qualified electrician. All work should comply with the IET Wiring Regulations (BS7671:2018+A2:2022).
- Isolate mains before installation
- Fit with correct gland fittings and torque (2.5Nm)
- Verify PME relay and SPD operation after commissioning
- Install indoors in a ventilated space (IP40 rated)
