Square D B13 Limit Switch Roller Arm Actuator

The Square D B13 limit switch with roller-arm actuator is an industrial sensing device that converts mechanical movement into an electrical signal when the roller arm is actuated. Designed for mounting on machines and control panels, the B13 variant uses a roller-type actuator to engage the internal contacts as parts reach a programmed position, providing a defined switch state change in response to travel. This type of limit switch supports end-of-travel sensing, machine sequencing, interlock safety circuits, and basic control logic in automated equipment, delivering a discrete input for downstream controllers. The roller-arm design offers a positive, repeatable actuation surface that helps maintain consistent operation in repetitive cycles. Typical applications include automation lines, conveyors, presses, and packaging equipment where precise position feedback is essential for reliable operation. By signaling a change in state when the arm is depressed, it helps coordinate motion and protect machinery from over-travel or misalignment.