Centaur 1-Gang Plastic Switch ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$281.24
Centaur 1-Gang Plastic Switch Box – 21 cu in with Adjustable Steel B Bracket (per 24)

Centaur 1-Gang Plastic Switch Box – 21 cu in with Adjustable Steel B Bracket (per 24)

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Model: PSB121-ADJ

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

$281.24
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The Centaur PSB121-ADJ is a 1-gang plastic switch box featuring a 21 cubic inch capacity and an adjustable steel B bracket for precise positioning between studs. Designed for new construction installations, the non-metallic box offers reliable insulation and durability while the pre-installed steel bracket ensures fast, stable mounting. Ideal for residential and light commercial electrical work, this box provides both flexibility and strength.

Manufacturer Resources

See Spec Sheet

Product Specs

Box Type:
Plastic Adjustable Switch Box
Gang Options:
1-Gang
Product Type:
Switch Box
Application:
Mounting and aligning wall switches with depth adjustment capability
Cubic Capacity:
21 cu in
Product Group:
Electrical Boxes
Product Subgroup:
Junction Boxes
Cable Entry:
(4) 1/2"
Product Height:
3.625 inches
Product Material:
Plastic
Product Weight:
0.41 lbs
Product Width:
2.25 inches
Department:
Electrical
Product Depth:
3.75 inches

Centaur PSB121-ADJ – Frequently Asked Questions

1) What does the adjustable B bracket on the Centaur PSB121-ADJ actually let me do?
The steel B bracket is what sets the box face relative to the stud, so you can dial in depth for the finished wall thickness instead of shimming or resetting the box after drywall goes up. That depth adjustment is the whole point of the ADJ version, and the bracket comes pre-installed on the box, so it is a nail-up-and-go item on a stud wall rather than a separate bracket you buy and attach.
2) Will a Centaur PSB121-ADJ switch box fit in a 2x4 stud wall?
Yes. The box measures 3.75 inches deep, 3.625 inches high and 2.25 inches wide, so the depth dimension sits within the 3-1/2 inch actual depth of a 2x4 stud only if set flush toward the drywall face, which is exactly what the adjustable bracket is there for. On standard 2x4 framing you set the bracket so the box face lands at the finished drywall plane.
3) Can I use this plastic switch box for a remodel or old-work cut-in?
No. The PSB121-ADJ is a bracketed new-construction box, meant to nail or screw to a stud before drywall goes on. For a cut-in on a finished wall you need an old-work box with wing clamps instead, since there is no exposed stud to fasten the bracket to.
4) Does a non-metallic switch box need a ground screw or bonding?
The PSB121-ADJ body is plastic, so the box itself is not an energized-fault path and does not require bonding the way a steel box does. You still carry the equipment grounding conductor through and land it on the device. Note the mounting bracket is steel, but the enclosure material is non-metallic.
5) How many cables can I bring into the Centaur PSB121-ADJ, and what size?
Four 1/2 inch cable entries are provided, so you can feed through a switch loop, run a downstream circuit, and still have openings left for travelers on a 3-way. That is enough entries to make this a feed-through box rather than a dead-end switch only.
6) Plastic or steel switch box for residential rough-in, which should I use?
A non-metallic box like the PSB121-ADJ is the usual choice where you are running NM cable in wood framing: it insulates, it does not need bonding, and it will not corrode. Go with a steel box where you are pulling into metal conduit or EMT and need the raceway bonded through the enclosure, or where a mechanical knockout connector is required. For residential and light commercial switch work this plastic box covers it.
7) Is the Centaur PSB121-ADJ sold individually or in a case?
It ships as a 24-piece quantity under model PSB121-ADJ, which suits rough-in work where you are setting switch boxes down a whole floor at once. Each box weighs 0.41 lbs.
How fast can I get the Centaur PSB121-ADJ 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 PSB121-ADJ come with a warranty?
Absolutely. The Centaur PSB121-ADJ 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 PSB121-ADJ?
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 PSB121-ADJ from ZenSupply?
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