Walther Electirc Building Walther Electric Inc. is pleased to present the latest member of the ProconboxX family: The iStart is a forward – reverse motor starter using solid state relays in a self contained IP65 enclosure, allowing for versatility in mounting locations! Wiring for both direction conditions are already integrated, and by using our proprietary SSR technology we have eliminated the need for dual contactors and mechanical interlocks - thereby reducing both cabinet space requirements and wiring times.

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Mechanical Interlock Devices

Worldwide Interchangeability


Walther Electirc Building

Walther's mechanical interlock receptacles are built to IEC 309-1 and 309-2 specifications and are completely compatible with not only Walther IEC 309-2 plugs, but with any manufacturer's plugs that conform to the IEC standards and coding system...anywhere in the world.




Designed to combine a disconnect switch and a receptacle into one compact device. Walther's mechanical interlock receptacles eliminate the possibility of making or breaking the circuit under load or making a haphazard connection. A mechanism within the enclosure prevents the switch from being turned to the "ON" position until the plug is fully engaged into the receptacle. Once inserted, the plug is locked in place when the switch is turned on and can't be removed until the switch is turned to the "OFF" position. This prevents making or breaking the circuit under load.

The integration of the switch and the receptacle in a single, compact enclosure encourages the safe operating practice of disconnecting at the switch rather than the plug and receptacle.

The nonmetallic enclosure, while abuse and corrosion resistant, is also non conductive, which enhances the safety of the product. The device can be connected to metallic conduit without interfering with the ground continuity. All mechanical interlock receptacles provide lockout protection for greater safety and complies with OSHA Lockout/Tagout requirements.

Pin & Sleeve diagram


These horsepower rated devices are available in 20, 30 and 60 amp ratings in both splashproof and waterproof versions.

Watertight (IP67) devices are designed for the most demanding environments and provide protection against corrosion, dirt, dust, splashing water and hose-directed water.

Splashproof (IP44) devices provide many of the heavy duty construction features found in the watertight devices, but at a more economical cost. These units are suitable and recommended for use in a variety of light industrial environments and provide protection against damaging deposits of dirt and dust, rain and splashing water.

Watertight and splashproof devices provide exceptional UV stability for superior outdoor performance.

For more information call toll free, in the U.S., (800) 925-8437 to speak to a representative or request our full line catalog of IEC 309-1 and 309-2 Pin and Sleeve devices.

Walther Mechanical Interlocks, with built-in circuit breakers, incorporate an interlocking receptacle with MCB Type "C" circuit breakers in a non-metallic enclosure that meets UL Type 4X (Wash down, Corrosion Resistant) requirements.

This new design combines the circuit breakers, switch and receptacle in a single enclosure. The Type "C" circuit breakers are mounted on DIN rail directly above the switch.


Walther Circuit-Breaker Mechanical Interlock

Walther Electirc Building

The new CIRCUIT-BREAKER Mechanical Interlock integrates a circuit breaker (which takes the place of a switch) and receptacle in a non-metallic enclosure that meets UL Type 4X (Wash Down, Corrosion Resistant) requirements.

Switched, Circuit Breaker Interlock Receptacles are available in 20, 30, 60 and 100 Amp (North American Ratings) and 16, 32, 63 and 125 Amp (International Ratings). UL489 Listed 22KAIC protection.