Load Balance Monitoring Relay
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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The WLB110 Load Balance Monitoring Relay is designed to actively monitor current draw and prevent overload conditions across EV, heat pump, solar, and other high-demand installs. By detecting and responding to current thresholds, it helps ensure safe load distribution and avoids nuisance tripping or circuit stress — particularly useful where...
The WLB110 Load Balance Monitoring Relay is designed to actively monitor current draw and prevent overload conditions across EV, heat pump, solar, and other high-demand installs. By detecting and responding to current thresholds, it helps ensure safe load distribution and avoids nuisance tripping or circuit stress — particularly useful where grid load limits apply.
Ideal for applications involving EV charge points, hybrid systems, and renewables, the relay can be set between 10–100A and works with most single and three-phase boards. It features voltage monitoring, adjustable delay settings, and fault indication LEDs for fast diagnostics.
- Adjustable current monitoring: Settable from 10A to 100A
- Phase loss & imbalance detection for consistent supply monitoring
- Automatic disconnection when load exceeds threshold
- LED indicators for real-time status and fault codes
- Compact DIN-mount design for easy integration into boards or enclosures
For full EV compliance, this relay is often paired with PEN Fault Detection Units or Surge Protection Devices to ensure safe and regulation-ready installs.
What does a load balance relay do?
It monitors the current draw on a circuit and disconnects power if the load exceeds a set threshold — helping prevent overloads and protect connected equipment. For EV and renewables, it’s commonly used alongside PEN protection devices.
Is this suitable for EV chargers?
Yes — it’s often used in EV charger installations where load monitoring is required for DNO compliance or grid balance protection.
Can it be used in three-phase systems?
Yes — the WLB110 supports both single and three-phase voltage monitoring up to 480V AC.
How do I set the current limit?
A simple dial allows current limits to be set between 10A and 100A depending on your application. For outbuilding boards, see our garage consumer units.
What happens when an overload is detected?
The relay opens the circuit and LEDs indicate the fault condition. It resets once the load drops below threshold or is manually reset depending on install logic. For extra resilience, pair with SPDs to guard against overvoltage events.
- SKU: WLB110
- Current Range: Adjustable 10A – 100A
- Operating Voltage: 200–480V AC
- Functions: Load monitoring, phase loss detection, imbalance protection
- Output Relay: 1NO/1NC contact
- Indicators: LED fault and power indicators
- Mounting: DIN rail compatible
- Enclosure Rating: IP20 (indoor use)
- Conformity: EN/IEC 60255
This unit is supplied ready to install in DIN-rail compatible enclosures. Settings must be adjusted according to the load profile and voltage range of the install.
- Mount directly to DIN rail in control board or distribution enclosure
- Set current threshold (10–100A) to match circuit limit
- Confirm proper connection of sensing and relay outputs
- LED indicators will show live status and trip/fault conditions