GL Series 160A 3P/4P Safety Disconnect Switch

It is a manually operated load break switch-disconnector that can simultaneously open (and close) multiple poles of a circuit, used to safely isolate equipment for maintenance. The "3P" version switches three phases, while "4P" switches three phases plus the neutral, so both can disconnect an entire three-phase circuit in one handle movement.

A 3P switch breaks only the three phase conductors; a 4P switch also breaks the neutral conductor. Choose 4P where the installation requires full galvanic isolation of the neutral (e.g., certain IT/TN systems, equipment isolation per local wiring rules) or where isolating the neutral is mandatory; choose 3P where the neutral is solidly connected and must not be interrupted.

A pure disconnector is an off-load device that must only be opened when no current is flowing, because it has no arc-breaking capacity. A switch-disconnector like the GL 160A is rated to make and break normal load current AND to satisfy isolation requirements, giving you both on-load switching and a certified isolating gap in one device.

The 160 A is the rated continuous current the switch carries. Whether it can switch a motor directly depends on its utilization category: AC-22 allows mixed resistive/inductive loads, while AC-23 is rated for direct motor switching and more demanding inductive loads. Check the nameplate category and the motor's full-load and locked-rotor current before using it as a motor-disconnect means.

The GL series is commonly supplied as a fuse-switch disconnector, meaning fuse links sit in the switch assembly. The switch itself handles normal make/break, while the fuse links melt on short circuit or severe overload to interrupt fault current — a duty the switch contacts alone are not rated to clear.

Generally no. A load break / switch-disconnector is rated to make and break load current but not to clear high short-circuit fault levels; that is why fused GL units rely on the integrated fuses. Treat the switch as the switching and isolation element and the fuses (or an upstream breaker) as the fault-protection element.

Mount the switch on a secure panel or enclosure, route each phase (and the neutral, on 4P) to the correspondingly marked terminals, and use lugs/cables sized to 160 A with the stated torque. Maintain proper phase barriers, earth the enclosure, and confirm the handle clearly shows ON versus OFF and that all poles move together.

In the OFF position the handle typically has a hasp or shackle that accepts a padlock, so the switch can be physically locked open and a tag attached. Multiple padlocks can often be fitted when several technicians are working on the circuit, ensuring no one can reclose it until the last person removes their lock.

Typical uses include machine-tool disconnects, HVAC and pump motor isolation, feeder switches in commercial distribution boards, and as a local emergency isolation point for industrial equipment. The 160 A rating suits medium three-phase loads that need a robust, manually operable isolating switch.

IEC 60947-3 is the IEC standard for low-voltage switches, disconnectors, switch-disconnectors, and fuse-combination units. It defines their rated voltages/currents, making and breaking capacities, utilization categories (AC-21/22/23), isolation (pollution and creepage) requirements, dielectric withstand, and mechanical endurance — so a compliant unit can be trusted both to switch load and to isolate safely.