Industrial-grade DPST rocker switch rated to 40A at 250VAC. Nylon 66 flame-retardant body, high-conductivity silver-alloy contacts, and integrated illuminated lamp. Designed for high-amperage power control in welding machines, workshop equipment, and heavy-duty industrial panels. Available in Red and Green.
Specifications
| Model | KCD4-Z High Power Series |
| Current Rating | 40A @ 250VAC (T125) |
| Configuration | DPST (Double Pole, Single Throw) — 6-pin |
| Panel Cutout (W × H) | 30.1–30.6mm × 21.9–22.0mm |
| Switch Face Size | 32.2 × 25.2mm |
| Terminal Width | 6.3mm (standard quick-connect spade) |
| Body Material | Nylon 66 (UL94V-0 flame-retardant) |
| Contact Material | Silver alloy |
| Operating Temperature | Up to 125°C (T125) |
| Withstand Voltage | 3000VAC / 1 min (terminals to button) |
| Mechanical Life | ≥10,000 cycles |
| Certifications | CQC, CB, CE |
Wiring — 6-Pin DPST
| Pins 1 & 2 (top row) | Line 1 IN → Line 1 OUT (one pole) |
| Pins 3 & 4 (middle row) | Line 2 IN → Line 2 OUT (second pole) |
| Pins 5 & 6 (bottom row) | Lamp supply (connect N and L for illumination) |
DPST switches two poles simultaneously — both Line 1 and Line 2 are connected and disconnected together. Use standard 6.3mm insulated spade connectors rated for the full current. For welding machines: use high-temperature insulated spades — loose connections at 40A will generate significant heat at the terminals.
What's Included
| 1 × | KCD4 40A rocker switch with integrated lamp (selected colour) |
Common Uses
Welding machines — MIG, TIG & inverter welder main power switches
Industrial control panels & high-draw motor controller enclosures
Workshop equipment — compressors, plasma cutters, bench power supplies
Heavy-duty pump controllers & industrial machinery power switching
Generator control panels requiring high-current switching
Any application requiring a robust illuminated 40A panel switch
Common Questions
What size panel cutout do I need?
30.1–30.6mm wide × 21.9–22.0mm tall — a rectangular cutout, not a round hole. The switch clips in from the front and is secured by the housing clips.
Does the lamp need to be wired separately?
Yes — the lamp pins (pins 5 & 6) need to be connected to your supply to illuminate. They are separate from the switching contacts. If you don't need the lamp, simply leave pins 5 & 6 unconnected — the switch will still function normally.
Can this replace my existing welding machine switch?
Very likely yes — the KCD4 series is the standard replacement switch used in most inverter welders and MIG machines worldwide. Verify the panel cutout dimensions (30×22mm) and terminal type (6.3mm spade) match your machine before ordering.
Please note: Mains AC voltage (250VAC) — all installation must be carried out by a registered electrician in accordance with NZ wiring standards. Use high-temperature insulated 6.3mm spade connectors. Terminal strength rated ≥80N.