Centaur 1-Gang Plastic Switch ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$128.19
Centaur 1-Gang Plastic Switch Boxes – Nail-On, 18–22 cu in (per 100)

Centaur 1-Gang Plastic Switch Boxes – Nail-On, 18–22 cu in (per 100)

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Model: PSB118

In Stock (leaves warehouse same day if ordered before 3pm ET)

$128.19
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Centaur 1-gang plastic nail-on switch boxes are built for new work residential and light commercial electrical installations. Made from high-strength non-metallic material, these boxes come in 18, 20, and 22 cubic inch capacities to suit varying wiring needs. The nail-on mounting style allows for quick and secure installation directly to studs, making them ideal for standard outlet or switch configurations during rough-in electrical work.

Stock Code Length Width Height Weight
PSB118 2.88 Inches 2.25 Inches 3.75 Inches 0.174 Pounds
PSB120 3.25 Inches 2.25 Inches 3.88 Inches 0.183 Pounds
PSB122 3.5 Inches 2.25 Inches 3.75 Inches 0.187 Pounds

Manufacturer Resources

PSB120
PSB122

Product Specs

Box Type:
Switch Box
Cubic Capacity:
18, 20, 22 cu in
Gang Options:
1-Gang
Mounting Feature:
Nail-On
Product Type:
Non-metallic outlet boxes
Product Group:
Electrical Boxes
Product Subgroup:
Junction Boxes
Product Material:
Plastic
Product Weight:
~0.174 lb (PSB118)
Department:
Electrical

Centaur PSB118 – Frequently Asked Questions

1) Can Centaur nail-on plastic switch boxes be used for old work / remodel, or new construction only?
New work only. The nail-on mounting flange fastens directly to the face of a stud before drywall goes up, so the boxes go in during rough-in. For cutting into finished drywall you need an old work box with wing clamps instead, not a nail-on.
2) Which cubic inch size do I need for a 1-gang switch box?
Centaur offers these 1-gang nail-on boxes in 18, 20, and 22 cubic inch capacities. Pick by conductor count: the more cables landing in the box, the more volume you need under the NEC box fill rules. A single switch on one 14/2 home run fits the 18; a box with a couple of cables in and out plus a device and grounds is where the 20 or 22 earns its place.
3) What are the actual dimensions of the Centaur PSB118, PSB120 and PSB122 switch boxes?
PSB118 measures 2.88 x 2.25 x 3.75 inches, PSB120 measures 3.25 x 2.25 x 3.88 inches, and PSB122 measures 3.5 x 2.25 x 3.75 inches. Width stays at 2.25 inches across all three, so the larger capacities gain their volume in depth, not in face size. That matters if your stud bay is shallow or you are boxing against a fire block.
4) Are these boxes sold individually or by the case?
The Centaur 1-gang nail-on switch boxes are packed 100 per carton. That is a rough-in quantity, aimed at an electrician wiring a whole house or a floor of light commercial rather than someone replacing one device.
5) Do plastic boxes need a ground screw or bonding like a metal box?
These are non-metallic boxes, so the box itself is not part of the grounding path and does not get bonded. The equipment grounding conductors are joined in the box and land on the device. If your job spec calls for a bonded metallic enclosure, a plastic box is the wrong choice.
6) Will a standard switch or receptacle and cover plate fit a Centaur 1-gang plastic box?
Yes. These are 1-gang switch boxes with the standard device mounting pattern, so any standard single-gang toggle switch, decorator device or duplex receptacle mounts in them and takes a standard 1-gang wall plate.
7) Are these Centaur boxes suitable for commercial work or residential only?
Both, within limits. Centaur specifies these nail-on plastic boxes for new work residential and light commercial installations. Heavier commercial and any job spec calling for metallic raceway or conduit connections needs a metal box instead, since non-metallic nail-on boxes are built for cable, stud-framed rough-in.
8) How much do these boxes weigh for a full carton of 100?
Each box runs about 0.174 lb for the PSB118, 0.183 lb for the PSB120, and 0.187 lb for the PSB122. Light enough that a carton of 100 is a one-hand carry up a ladder, which is the practical difference from stocking steel boxes on a rough-in.
How fast can I get the Centaur PSB118 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 PSB118 come with a warranty?
Absolutely. The Centaur PSB118 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 PSB118?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Centaur PSB118 from ZenSupply?
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