PER1MT-5 - Parker Style 1-Button Momentary TIG Torch Switch

Technical Overview of the Parker PER1MT-5 Control Switch

The Parker PER1MT-5 is a specialized electromechanical control interface designed for Gas Tungsten Arc Welding (GTAW) applications. This unit functions as a momentary single-pole, single-throw (SPST) switch, primarily utilized for remote contactor actuation. In the context of industrial TIG welding, the reliability of the arc initiation sequence is paramount. The PER1MT-5 addresses this by employing a high-cycle microswitch mechanism housed within a ruggedized, ergonomic shell. The switch provides a tactile 'click' response, ensuring the operator receives positive feedback upon circuit closure, which is critical for precise timing during tack welding or pulsed operations.

Mechanically, the device is engineered to withstand the harsh environment of a fabrication shop. The external housing is molded from high-impact polymer, resistant to thermal cycling and incidental impact. The actuator button is covered by a sealed rubber boot, which serves a dual purpose: it provides a non-slip surface for the operator's thumb, even when wearing heavy welding gloves, and it prevents the ingress of conductive grinding dust, metal fines, and atmospheric moisture that could compromise the switch contacts. This ingress protection is vital for maintaining the integrity of the low-voltage control signal, especially in environments where high-frequency (HF) start signals are present, as poor contact integrity can lead to erratic arc starting or signal interference.

Installation of the PER1MT-5 is designed for versatility. The unit typically mounts to the TIG torch handle using a secure strapping or zip-tie mechanism, allowing it to be positioned according to the welder's handedness and grip preference. The electrical interface consists of a standard 2-wire lead, which can be terminated with various amphenol or aviation-style plugs depending on the specific power source requirements. This universality makes the PER1MT-5 an excellent service part for maintenance, repair, and operations (MRO) inventories, capable of retrofitting or repairing a wide array of torch brands including Parker, Weldcraft, and generic WP-series torches. It simplifies the control circuit to a binary on/off state, removing the complexity of potentiometers when simple contactor control is all that is required.