Equipment - Resistance Welding SCR Contactors


Metal Oxide Varistor (MOV)

Have SCI mount a Metal Oxide Varistor (MOV) to your contactor to protect your SCR's from transient voltage surges. MOV's are ideally suited to welding applications. Their high clamping efficiency and low steady state power dissipation offer considerable advantages in protecting the SCR Contactor and control circuitry. SCI's MOV's feature high surge current capability, instantaneous response in a compact and robust package. Selection of the MOV is governed by incoming line voltage and SCR voltage rating (PIV).
Available in PA or LA series types.


Encapsulated Type Unencapsulated Type

SCI's stocks the full line of thermostats commonly found on resistance welding contactors. Choose from non-encapsulated or encapsulated packages in various temperature ratings.

SCI's exclusive encapsulated thermostat is available in 50°C and 70°C, normally closed, and tested for 2000 Volt isolation.

These thermostats are ideal for moist areas or where contactors commonly sweat.

R/C Snubber

SCI's encapsulated Resistor and Capacitor Snubber is ideal for SCR protection from false firing and high voltage surges commonly found in resistance welding applications.

Available off the shelf, our R/C Snubbers can be added for use across all SCR Contactors to 600 Volt A.C. lines.

R/C/M Snubber

SCI's new encapsulated Resistor, Capacitor and MOV Snubber further reduces labor and simplifies welding controller wiring. All three components are encapsulated and pre-wired in the same convenient package.

Click to Enlarge Schematic

Portable Diode and SCR Tester

SCI's Diode and SCR Tester puts the sophisticated testing capability of high-priced, specialized units into a portable package that is economically priced and easy to use. It includes provisions for checking diodes and SCR's for opens, shorts, leaks, and breakdown under actual operating conditions.

The Tester is a compact 6 x 12 x 17 inches, weighs 14 pounds, and operates on 120 Volt A.C. current.

It comes complete with test leads and clamp for checking flatpack DIODES and SCR's.

Spotwelding Consultants Inc.

4209 Industrial
Rowlett, Texas 75088

Toll Free: 888-255-6780
Phone: 972-475-0874
Fax: 972-475-5024