Multi-pole switch configuration · 4PST
4PST Switch
A 4PST switch opens or closes four electrically separate paths with one actuator. This page explains the contact logic and the information WEUP needs to evaluate a four-pole sourcing request.
- 4 independent poles
- 1 switched path per pole
- 1 shared actuator
Circuit function
What is a 4PST switch?
“Four pole” means four electrically separate circuits are controlled. “Single throw” means each pole has one switched output. All four poles move together under one actuator.
A 4PST requirement can be normally open or normally closed depending on the mechanism and circuit. The required state and operating action must be documented in the inquiry.
Because 4PST is a circuit configuration rather than one housing style, buyers should provide a drawing or current sample whenever possible.
Configuration references
4PST visual references
WEUP’s current first-party media library provides 4PST contact diagrams rather than a verified model-specific product photo. They are used here only to explain the circuit logic.
Multi-pole comparison
4PST vs. other multi-pole configurations
Separate pole count, throw count and switch action before choosing the housing or actuator style.
| Configuration | Poles | Throws per pole | Control logic | Use when |
|---|---|---|---|---|
| 3PST | 3 | 1 | Three circuits ON/OFF together | Three isolated paths must follow one actuator |
| 3PDT | 3 | 2 | Three circuits change between two paths | Three coordinated changeover channels are required |
| 4PST | 4 | 1 | Four circuits ON/OFF together | Four isolated paths must follow one actuator |
| 4PDT | 4 | 2 | Four circuits change between two paths | Four coordinated changeover channels are required |
Related pages: 4PDT switch page, 3PST switch page, pole-and-throw guide.
Buyer checklist
How to specify the right 4PST switch
Multi-pole requirements need a complete circuit map. These checks keep one visual match from becoming a wiring or installation mismatch.
Four-pole state
Define normally open or normally closed behavior for all four linked circuits.
Actuation
Specify maintained or momentary operation and the required rest state.
Load on every pole
Provide voltage, current and load type for each of the four paths.
Terminal and mechanism
Share the required terminal form, spacing, numbering and preferred actuator type.
Installation envelope
Provide cutout, panel thickness, available depth and retention constraints.
Drawing or sample
Include a circuit drawing, product photo, sample or existing part reference for evaluation.
Application fit
Where 4PST switches are considered
Application fit depends on the complete circuit, load, mounting and operating environment—not the configuration name alone.
Four-path equipment isolation
Four documented conductors can open or close together when the selected device and system are suitable.
Coordinated control circuits
One action changes four electrically isolated control paths at the same time.
Power and signal grouping
Multiple paths can be coordinated while remaining electrically separate.
Test and service equipment
Four-pole state control in purpose-designed fixtures and panels.
Industrial operator interfaces
A single maintained or momentary action can control four documented channels.
Custom switch assemblies
A sample-led or drawing-led solution may be appropriate when standard formats do not fit.
Faster sourcing
What to send with your inquiry
A model drawing or current sample is the fastest reference. Otherwise, send the project facts below.
- Complete multi-pole circuit map
- Required switching action
- Voltage, current and load on every pole
- Terminal style and physical layout
- Panel dimensions and installation depth
- Operating environment
- Target quantity and schedule
- Existing drawing, photo or sample
FAQ
4PST Switch questions
What does 4PST mean on a switch?
4PST means four pole, single throw. Four isolated paths open or close together under one actuator.
How is 4PST different from 4PDT?
4PST provides one switched path per pole for coordinated ON/OFF control. 4PDT changes each of four poles between two outputs.
Does a 4PST switch always have eight terminals?
A basic contact set may use two switching terminals per pole, but the exact terminal count and arrangement depend on the product design.
Can WEUP quote from a diagram only?
A circuit diagram is the starting point. Panel dimensions, load, action, environment, quantity and preferably a sample or product reference are also needed.
Why are the images circuit diagrams?
They are the verified first-party 4PST visual references currently available. They explain contact logic without pretending to show a specific physical product.
Need a 4PST switch matched to your project?
Share the circuit, action, loads, terminal layout and panel requirements. WEUP can use those details to discuss a suitable sourcing route.