Allen-Bradley 813S-V0WE Three-Phase Line Voltage Monitor Relay, Phase Loss & Unbalance Detection

Allen-Bradley 813S-V0WE Three-Phase Line Voltage Monitoring Relay

Allen-Bradley 813S-V0WE is a solid-state line voltage monitor relay engineered for three-phase electrical systems operating at 120V AC. It continuously evaluates voltage symmetry and phase integrity to protect control circuits from abnormal line conditions.

Integrated Three-Phase Voltage Fault Detection

• Monitors voltage unbalance using negative sequence voltage sensing
• Detects phase failure and incorrect phase rotation
• Hermetically sealed output relay for control circuit signaling
• LED indicators for normal, alarm, and output relay status

Solid-State Monitoring Architecture

The relay operates by analyzing negative sequence voltage components within the connected three-phase system. When abnormal conditions exceed the internal threshold, the output contact changes state after a defined time delay to signal a fault condition or loss of monitored voltage.

Industrial Control Applications

• Three-phase motor control and protection circuits
• Monitoring systems using potential transformers
• Industrial panels requiring phase integrity supervision