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These plastic old work switch boxes are ideal for retrofit installations in existing walls. Designed for fast, secure mounting without the need for stud access, each box includes integral mounting tabs or clamps to ensure a reliable fit. Constructed from high-strength, non-conductive thermoplastic, they offer durability, corrosion resistance, and easy installation across a range of gang configurations and cubic capacities.
| Variant SKU | Depth (Length) | Width | Height | Cubic Capacity |
|---|---|---|---|---|
| PSB355‑OW | 5.72″ | 6.00″ | 3.72″ | 35 cu in |
| PSB468‑OW | 7.57″ | 7.75″ | 3.75″ | 68 cu in |
PSB355-OW
Product Specs
- Box Type:
- Plastic Old Work Switch Box
- Gang Options:
- 3-Gang / 4-Gang
- Product Type:
- Switch Box
- Application:
- Installing electrical devices in existing walls
- Cubic Capacity:
- 35 / 68 cu in
- Mounting Feature:
- Old Work
- Product Group:
- Electrical Boxes
- Product Subgroup:
- Junction Boxes
- Product Material:
- Plastic
- Department:
- Electrical
Centaur PSB355-OW – Frequently Asked Questions
1) Can I use a Centaur old work switch box in a finished wall without opening it up to reach a stud?
That is what the old work design is for. The Centaur plastic switch boxes mount into existing drywall using integral mounting tabs or clamps that grip the wall material, so no stud access is needed. Cut the opening, feed your cable, set the box, and tighten the tabs. If you are framing new walls and can nail to a stud, a new work box is the cheaper choice.
2) What size opening do I need to cut for the Centaur 3-gang and 4-gang old work boxes?
Size the cutout to the box body. The 3-gang PSB355-OW measures 5.72 inches deep (length) by 6.00 inches wide by 3.72 inches high, and the 4-gang PSB468-OW is 7.57 by 7.75 by 3.75 inches. The 3.72 to 3.75 inch figure is the dimension that has to clear inside your wall cavity, so check insulation and blocking before cutting on a 4-gang.
3) Do these Centaur boxes need a ground screw or bonding jumper?
The box body is non-conductive thermoplastic, so the enclosure itself is not part of the grounding path and needs no bonding. Carry your equipment grounding conductors through and land them on the device green screws, splicing the grounds together in the box. That is the practical difference from a steel box, where the box has to be bonded.
4) Should I pick plastic or metal for retrofitting a 4-gang switch bank?
Plastic is the usual pick for residential and light commercial retrofit with NM cable: it is non-conductive, corrosion resistant, and there is no box bonding to deal with. Go to a steel box instead if the run is EMT or MC, if the location calls for a metallic raceway system, or if the spec requires it. The Centaur old work boxes are the plastic option, in 3-gang at 35 cubic inches and 4-gang at 68.
5) I manage apartments and keep replacing cracked switch boxes behind multi-switch plates. Is this the right part?
For a multi-switch wall in a finished unit, yes. These are old work boxes, so the replacement goes in through the existing wall opening without cutting back to framing, and the thermoplastic body will not corrode or rust in damp interior walls. Match the gang count to the plate you are putting back: 3-gang for three switches, 4-gang for four.
6) How many boxes come in a pack of Centaur old work switch boxes?
They ship six to a pack, in one gang configuration per pack: either six 3-gang 35 cubic inch boxes or six 4-gang 68 cubic inch boxes. If you need a mix of 3-gang and 4-gang on a job, order a pack of each rather than expecting them combined.
How fast can I get the Centaur PSB355-OW delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Centaur PSB355-OW come with a warranty?
Absolutely. The Centaur PSB355-OW is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Centaur PSB355-OW?
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selection,
installation tips, and troubleshooting. Contact Us
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