Bryant 4921 Series SPDT Moment...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$57.04
Bryant 4921 Series SPDT Momentary-Contact AC Switch, 20A

Bryant 4921 Series SPDT Momentary-Contact AC Switch, 20A

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Model: 4921I

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

$57.04
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Bryant 4921 Series SPDT Momentary-Contact AC Switch, 20A

The Bryant 4921 Series covers a family of single-pole double-throw (SPDT) momentary-contact AC switches rated 20A, available in three configurations — 4921, 4921I, and 4921L — to suit different control and installation requirements. Every switch in the 4921 Series shares the same core function: on-demand circuit control that automatically returns to its normal position once released. Because these switches are momentary rather than maintained, they actuate only while physically engaged, making them well suited for control functions where a brief, repeatable signal is preferred over a continuous on/off state. Built for use in AC electrical systems, the 4921 Series delivers dependable momentary switching action for control circuits, equipment signaling, and general-purpose electrical control tasks. The shared 20A amperage rating across the series supports demanding electrical control applications where consistent, repeatable switching performance is required from a compact, purpose-built switching device.

Key Features

  • SPDT Switch Configuration: The single-pole double-throw (SPDT) design allows the 4921 Series to direct current between two separate circuit paths from a single input, giving installers flexibility when wiring control and signaling circuits that require switching between two states.
  • Momentary Contact Action: Momentary-contact operation means each switch actuates only while engaged and automatically returns to its normal, resting state once released, which makes it a practical choice for pushbutton-style control functions and equipment that needs a brief triggering signal.
  • AC Switch Rating: The 4921 Series is engineered specifically for AC circuit applications, providing dependable, repeatable performance in control, signaling, and general electrical switching circuits found in commercial and industrial settings.
  • 20A Amperage Rating: Rated at 20A across all series models, the switch is built to handle the electrical control loads typical of commercial and industrial control circuits, supporting consistent switching performance over repeated cycles.
  • Model Options: The 4921 Series is available as 4921, 4921I, and 4921L, giving specifiers a choice of configuration while retaining the same SPDT momentary-contact function and 20A rating across every option.
  • Compact Control Device: As a dedicated momentary switch family, the 4921 Series is designed to integrate into control panels, pushbutton stations, and switching assemblies where a reliable SPDT momentary function is required.

Technical Specifications

  • Amperage Rating: 20A
  • Switch Configuration: SPDT, Momentary-Contact
  • Model Options: 4921, 4921I, 4921L

Typical Applications

  • Momentary Control Circuits and Pushbutton Stations, where a brief triggering signal is required to initiate an operation.
  • Motor Control and Equipment Signaling, providing a reliable momentary input to start, stop, or signal connected equipment.
  • Industrial and Commercial Control Panels, where SPDT momentary switching is used to route control signals between circuits.
  • General AC Circuit Switching Applications, supporting a wide range of 20A-rated control and switching tasks.
  • Panelboard and Control Enclosure Wiring, integrating into control assemblies that rely on momentary-contact switching.

Why Bryant?

Bryant electrical products are engineered to deliver dependable performance for professional electrical control applications. The 4921 Series SPDT momentary-contact switches are built to provide consistent, repeatable switching action at their rated 20A capacity across every model option, supporting reliable control circuit performance across commercial and industrial environments. Choose Bryant for electrical components engineered to perform reliably in demanding control and switching applications where consistent momentary actuation is essential.

Product Specs

Product Type:
Specialty Switch
Amperage Rating:
20A
Configuration:
SPDT Momentary-Contact
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Switches
list_batch:
BRY-20260909

Bryant 4921I – Frequently Asked Questions

1) What is the difference between a momentary-contact switch like the Bryant 4921 and a standard maintained toggle switch?
A maintained switch stays where you put it, on or off, until someone moves it again. The Bryant 4921 Series is momentary: it only makes contact while you are physically holding it, and it springs back to its normal position the moment you let go. That makes it the wrong choice for controlling room lighting or a receptacle you want to stay energized, and the right choice for a brief triggering signal, start/stop input, or equipment signaling. If you want a switch that holds its state, use a maintained toggle such as the Pass & Seymour CS15AC3 commercial specification grade toggle instead.
2) What does the SPDT configuration on the Bryant 4921 switch let me wire?
SPDT gives you one common input and two output paths, so a single actuation can route a control signal between two circuits rather than just breaking one. On the 4921 Series that pairs with momentary action: while held, the common transfers to the second path, then snaps back. That is the arrangement you want for a momentary transfer input to a control relay, a start/stop pushbutton station, or an equipment signaling circuit. If your job only needs a single on/off leg, a single-pole device is the simpler buy.
3) Can I use a Bryant 4921 switch to control lighting in an apartment or office?
No, not for normal room lighting. The 4921 Series only closes while it is being held and releases as soon as you let go, so the lights would go out the instant you took your hand off. For a wall switch that stays on, look at a maintained device such as the Pass & Seymour 2623W 20A three-way decorator paddle switch or the TradeMaster 15A decorator switch. Reserve the 4921 for momentary control inputs, pushbutton stations, and equipment signaling.
4) My control circuit is DC and high fault current. Is the Bryant 4921 the right switch?
No. The Bryant 4921 Series is built specifically for AC circuit applications at 20A with SPDT momentary-contact action. For a DC application with a high fault-current requirement, the Bussmann TPHCS-250 TPH Series high-current switch is the relevant device, rated 80 Vdc with a 100kA short-circuit current rating. Keep the 4921 Series on AC control and signaling duty.
5) Can a Pass & Seymour 2623W 3-way paddle switch be used in place of the Bryant 4921 momentary switch?
No. The Bryant 4921 Series is an SPDT momentary-contact switch, meaning it actuates only while held and springs back to its resting position on release. The Pass & Seymour 2623W is a specification grade 3-way decorator paddle switch rated 20A at 120V/277V, which is a maintained-contact device that stays where you leave it. Both are 20A, so the current rating lines up, but a 3-way maintained switch cannot produce the brief triggering pulse a momentary control circuit needs. Use the 2623W for lighting legs switched from two locations, and the 4921 Series where a pushbutton-style momentary signal starts, stops, or signals equipment.
6) Can a Bryant 4921 momentary switch handle a 20 amp control circuit?
Rated 20A, and that rating holds across all three models in the 4921 Series, so the same capacity applies whether you order the 4921, 4921I, or 4921L. That covers the control and signaling loads typical of commercial and industrial control circuits. It is an AC switch, built for AC circuit applications.
7) What is the difference between Bryant 4921, 4921I and 4921L when I am ordering?
All three are the same device electrically: SPDT, momentary-contact, 20A AC. The suffix is the configuration choice, so specify the part number your drawing or existing device calls out: 4921, 4921I, or 4921L. Order by the exact number, since the function and rating will not tell them apart.
8) How does the Bryant 4921 compare with a Pass & Seymour CS15AC3 commercial spec grade toggle switch?
The Pass & Seymour CS15AC3W and CS15AC3I are commercial specification grade toggle switches, offered in white and ivory respectively. They are toggle-actuated maintained devices for conventional branch circuit switching. The Bryant 4921 Series is a different animal: SPDT momentary-contact rated 20A, intended for control panels, pushbutton stations and equipment signaling where the contact makes only while engaged. If your drawing calls for a commercial spec grade wall toggle, the CS15AC3 family answers it; if it calls for a momentary SPDT control input, the 4921, 4921I or 4921L does.
9) Will a Bryant 4921 momentary switch work inside a control panel or pushbutton station?
That is its intended home. The 4921 Series is a dedicated momentary switching device meant to integrate into control panels, pushbutton stations, switching assemblies, and control enclosure wiring, routing a brief SPDT signal between circuits. Typical uses include motor start/stop inputs and equipment signaling.
How fast can I get the Bryant 4921I 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 Bryant 4921I come with a warranty?
Absolutely. The Bryant 4921I 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 Bryant 4921I?
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
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