Disconnect Switches
Industrial Disconnect Switches for Improved Safety and Isolation
Disconnect switches, also called safety switches or disconnects, provide a visible means of isolating equipment from its power source so technicians can perform service and maintenance safely. In automation and control systems, they are installed ahead of motor loads, control panels, drives, and other equipment to shut off power and establish an electrically safe work condition.
Unlike contactors used for frequent automatic switching, disconnect switches are primarily manual devices used to open and close circuits under load within their ratings or to provide isolation after upstream protective devices interrupt fault current. Many designs include lockable handles and clear ON/OFF indication to support lockout/tagout procedures and help prevent accidental re-energization.
Galco offers enclosed and open disconnect switches, solar disconnect switches, transfer and double-throw switches for selecting between normal and backup sources, bypass switches for critical systems and a full range of disconnect switch accessories. This allows panel builders, OEMs, and maintenance teams to match voltage, current, enclosure type, and safety features to each installation.
Frequently Asked Questions
How do I choose the correct disconnect switch for my system?
Match the switch’s voltage and current rating to your system’s supply and load. Choose a fuse or non-fuse-type depending on where overcurrent protection is implemented. Verify enclosure rating, environmental conditions, and mounting. Use visible-break switches when safety isolation or lockout/tagout procedures are required. Confirm compliance with relevant electrical codes or standards.
What is the difference between fused and non-fused disconnect switches?
A fused disconnect includes overload protection via fuses, providing both isolation and circuit protection. A non-fused (switch-only) disconnect simply opens or closes the circuit and relies on external overcurrent protection elsewhere in the circuit.
Use fused disconnects when you want built-in protection; use non-fused if protection is already provided upstream or by other devices.
Can disconnect switches be used for motors and variable speed drives?
Yes. Disconnect switches are commonly used as the main power disconnect for motors, drives, and control panels. Ensure that the switch rating (voltage, current, and duty cycle) matches the motor or drive requirements.
For variable speed drives (VFDs), verify that the switch provides safe isolation and meets any specific standards required by the drive manufacturer.