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The Centaur CM-FSSB-XL FS Saddle Box is a 4" round, 16 cubic inch surface-mount electrical box designed for secure mounting of light fixtures, ceiling fans, or electrical devices in exposed or industrial settings. Constructed from durable plastic, the box features an extended depth (XL) to provide extra room for wiring and connections.
Its integrated mounting feet and reinforced construction make it ideal for use in surface applications such as garages, workshops, basements, and utility spaces.
Manufacturer Resources
See Spec Sheet
Product Specs
- Box Type:
- 4" FS Saddle Box
- Product Type:
- Electrical Box
- Application:
- Enclosing and protecting electrical connections in surface mount applications
- Color Options:
- Gray
- Cubic Capacity:
- 16 cu in
- Mounting Feature:
- Saddle Mount
- Product Group:
- Electrical Boxes
- Product Subgroup:
- Junction Boxes
- Product Diameter:
- 4 inches
- Product Weight:
- 0.25 lbs
- Department:
- Electrical
- Product Depth:
- 2.75 inches
Centaur CM-FSSB-XL – Frequently Asked Questions
1) Will a Centaur CM-FSSB-XL saddle box hold a ceiling fan?
The CM-FSSB-XL FS saddle box is described as being for secure mounting of light fixtures, ceiling fans, or electrical devices, and it uses a saddle mount with integrated mounting feet. Bear in mind that a fan-rated box only does its job if the mounting feet land on solid structure, not on drywall alone. It is a surface-mount box, so it sits on the face of the ceiling or joist rather than being recessed.
2) How many conductors can I legally put in a 16 cubic inch electrical box?
16 cubic inches is the usable volume of the Centaur CM-FSSB-XL saddle box. Box fill is counted per conductor size: at 2.00 cu in per #14 conductor that gives 8 allowances, and at 2.25 cu in per #12 it gives 7. Every device, clamp set, and all the grounds eat into that count, so a fan with a splice and a ground on #12 typically leaves you room but not much slack. The 2.75 inch depth is where the extra volume comes from.
3) Is the Centaur CM-FSSB-XL a recessed box or does it mount on the surface?
Surface mount only. The CM-FSSB-XL sits on the face of the finish, which is why the application listed for it is enclosing and protecting electrical connections in surface mount applications. With a 4 inch diameter and 2.75 inch depth, it stands most of three inches off the ceiling or wall once installed, so it suits garages, workshops, basements, and utility spaces rather than finished living space where you want the box buried in the cavity.
4) Is the Centaur saddle fan support box metal or plastic?
Plastic. The CM-FSSB-XL is a non-metallic box, which means it is not part of the equipment grounding path the way a metal box is, so your ground has to be carried through on the wire to the device. Non-metallic also means no bonding jumper to the box itself and no rust in a damp basement or garage. Each box weighs a quarter pound.
5) Will a standard 4 inch round fixture canopy or cover cover this box?
The Centaur CM-FSSB-XL is a 4 inch round box, so a fixture canopy or blank cover sized for a 4 inch round pattern is what you want. Anything cut for an octagonal or square 4-11/16 box will not line up. If you are standardizing across a building, the 4 inch round pattern is the one to spec on your cover order.
6) Does the Centaur CM-FSSB-XL come as a single box or in a multi-pack?
It ships 20 to a pack, one model, CM-FSSB-XL, in gray. For a property manager or MRO buyer doing a run of garage or utility fixtures that is a sensible standardizing quantity; if you need a single box for one repair, this is not the right line item.
7) What is the difference between the XL saddle box and a standard depth 4 inch saddle box?
Depth, and therefore wiring room. The XL on the Centaur CM-FSSB-XL is the extended depth version, running 2.75 inches deep for 16 cubic inches of volume. That extra room matters when you are landing a fan with a splice pack, or feeding through with several conductors rather than terminating a dead end. On a single lamp holder with one cable in, a standard depth box is usually enough.
8) Where can I get the spec sheet for the Centaur CM-FSSB-XL box?
Centaur publishes a datasheet for the CM-FSSB-XL, hosted at https://zensupply.com/content/pdf/tamco/centaur_datasheet_stepid-521639.pdf. That is the document to attach when a spec on the drawing calls for a submittal on the box.
How fast can I get the Centaur CM-FSSB-XL delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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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 CM-FSSB-XL come with a warranty?
Absolutely. The Centaur CM-FSSB-XL 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 CM-FSSB-XL?
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