ABB A40-30-10-84 Electrical Contactor

ABB A40-30-10-84 is a 3-pole, 3‑phase AC contactor in the A40 frame, built to switch moderate‑to‑high power loads in industrial control panels. The device is commonly specified at about 42 A continuous current and is rated for up to 600 V across the main contacts, with horsepower ratings of roughly 15 HP at 240 V, 30 HP at 480 V, and 40 HP at 600 V. It uses a 110–120 VAC control coil (50/60 Hz) that can be driven from standard control circuits, enabling reliable energization from common PLC outputs or relays. The A40-30-10-84 configuration typically includes one normally open auxiliary contact and no normally closed auxiliary contact, supporting basic signaling or interlock tasks in the control circuit. This ABB/Allen‑Bradley contactor is widely used to start and stop three‑phase motors, lighting circuits, pumps, and other high-current loads in machine control, conveyors, and processing lines, where a compact, widely stocked contactor in the 40‑amp class is appropriate. The 3‑pole arrangement provides separate switching for each line, and the unit is designed for panel mounting in standard electrical enclosures, making it a common replacement or retrofit option for compatible ABB A‑Line systems.