Load Balance Monitoring Relay
The WLB110 Load Balance Monitoring Relay is designed to actively monitor current draw and prevent overload conditions across EV, solar, and other high-demand installs. By detecting and responding to current thresholds, it helps ensure safe load distribution and avoid nuisance tripping or circuit stress - particularly useful where grid load...
The WLB110 Load Balance Monitoring Relay is designed to actively monitor current draw and prevent overload conditions across EV, solar, and other high-demand installs. By detecting and responding to current thresholds, it helps ensure safe load distribution and avoid nuisance tripping or circuit stress - particularly useful where grid load limits apply.
Ideal for applications involving EV charge points, heat pumps, 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
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.
Is this suitable for EV chargers?
Yes - it’s often used in EV and hybrid 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.
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.
- 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