ER12-40N3GMS is a non-fused disconnect switch designed for industrial circuit protection and load isolation applications. The switch features a 40 A amperage rating, 3-pole configuration, and is housed in a NEMA 12 enclosure with a black pistol-grip handle. It operates at 600 V AC and provides reliable switching for service, feeder, and branch circuit applications. This switch is commonly used in industrial control panels, machinery disconnects, and power distribution systems where safe isolation of electrical circuits is required without fuse protection.