Westinghouse Electric BST-ON On-Delay Timing Relay

The Westinghouse BST-ON On-Delay Timing Relay provides on-delay output activation for industrial automation and motor control systems. With an adjustable on-delay range of 0–30 seconds, this solid-state timing relay operates from 120V AC 60 Hz or 110V AC 50 Hz and supports a maximum inductive load of 132 VAC at 0.5 A. Designed as a panel- or relay-mounted attachment, BST-ON is compatible with industrial control panels, contactors, and relay systems, and is commonly used to delay motor startup, sequence machine operations, and prevent simultaneous energization through delayed switching in HVAC controls and other equipment. Output contacts activate after the preset delay interval, enabling precise timing control for motor sequencing and process timing in automation tasks, and it is suitable for replacement, retrofit, or routine control-system maintenance by maintenance electricians, control engineers, and technicians.