Product Introduction

The TOMZN TO119G/TO219G/TO319G/TO419G series changeover switches are versatile manual isolation switches integrating four core functions: On, Off, Transfer, and Isolation. They enable safe switching or isolation between two loads on a single line or between two independent power sources (e.g., utility and generator). Constructed with a high-flame-retardant PA66 housing for durability, these switches are designed for easy DIN rail (35×7.5mm) mounting. Rated at 125A and 400V AC, they provide a reliable and safe solution for power switching and isolation in industrial equipment and circuits. The switches feature three positions: I (Source 1 connected), Off (both groups disconnected), and II (Source 2 connected), with complete electrical interlocking to prevent simultaneous connection of both sources.

Product Data Sheet

Model: TO119G / TO219G / TO319G / TO419G

Number of poles: 1P / 2P / 3P / 4P

Rated voltage: 400V AC, 50/60Hz

Rated current: 125A

Ui (Rated insulation voltage): 690V

Uimp (Rated impulse withstand voltage): 4kV

Housing material: High-flame-retardant PA66

Installation method: 35mm DIN rail

Functions: On, Off, Transfer, Isolation

Handle positions: I (Source 1), Off (middle), II (Source 2)

Wiring flexibility: Incoming/outgoing wires adjustable; for dual power switching, lower in and upper out must be used

Application: Industrial equipment, circuit isolation, dual power source switching