Product Overview
ETA 3120-F621 Rocker Circuit Breaker - 2.5A, 250VAC/28VDC, Snap-In Panel Mount, UL/CE Rated
Condition
Unused NOS. Nine units are offered together, all unused old stock sourced from a government research facility. Photo label confirms 3120-F621-P7T1-R 12L, 2.5A, AC250V DC28V. UL and CE markings visible on label. No wear, damage, or defects observed across all units.
Carefully packed and shipped same or next business day from our Idaho warehouse. Honest equipment and straightforward service.
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Product Overview
ETA 3120-F621-P7T1-R thermal circuit breaker combining overcurrent protection with a rocker ON/OFF switch in a single panel-mount body. Rated 2.5A, 250VAC, 28VDC. Black rocker body with white ON/OFF and I/O markings; two gold-tone blade terminals; blue indicator lenses visible on unit face. Snap-in panel mount with 44.5 x 22mm cutout. UL and CE certified per label markings. Part of the 3120-F series, which combines trip-free thermal protection with a user-operable switch - the breaker will not reset while an overload condition persists even if the rocker is held in the ON position.
Key Features
- 2.5A current rating, 250VAC / 28VDC voltage rating
- Rocker actuator with ON/OFF and I/O markings - switch and breaker in one unit
- Trip-free mechanism - circuit stays open under overload even if rocker is held ON
- Snap-in panel mount, 44.5 x 22mm cutout
- Blade terminals (P7 designation) - two gold-tone pins confirmed by photo
- UL and CE certified - confirmed by label markings on unit
- Black matte body marked E·T·A and GERMANY; blue indicator lenses on face
- Nine unused units available from the same government research facility lot
Applications
- Maintenance technician pulling a tripped breaker from a control panel and dropping in a direct replacement - same cutout, same ratings, back in service
- OEM designer integrating a single-component switch-and-breaker into a motor drive, audio amplifier, or medical instrument chassis where panel space is at a premium
- Marine electrician replacing a failed breaker in a boat's AC/DC distribution panel, where the dual voltage rating and compact rocker form factor match standard marine panel cutouts
- Industrial repair shop stocking exact ETA 3120-F621 replacements for equipment with recurring panel breaker failures
Frequently Asked Questions
The working title says 3120-F521 but the label shows 3120-F621-P7T1-R. Which is the actual part number?
The label on the unit - confirmed in the product photos - reads 3120-F621-P7T1-R 12L. That is the part number to use for cross-referencing and direct replacement. The 3120-F521 designation appears to be a series-level reference. Verify the full suffix against your application before ordering.
What are the confirmed electrical ratings?
Label markings confirmed by photo: 2.5A, AC250V, DC28V. These match the seller's notes. Verify against your circuit requirements before installation.
What mounting cutout does this breaker require?
Snap-in panel mount requiring a 44.5 x 22mm cutout, per seller notes. Verify your panel before installation.
How many units are included in this listing?
Nine units - all from the same unused government research facility lot. The product photos show all nine units.
Are manuals or documentation included?
Not included. These are surplus units only.
Is the 3120-F series considered current or obsolete?
The 3120-F series is classified as obsolete by ETA. Parametric equivalents exist in ETA's 3130 series with identical electrical and mechanical specifications, per research notes. For replacement or maintenance applications, this NOS stock represents available inventory of the original part.
Government surplus is one of those channels where the right obsolete part surfaces at exactly the right moment - nine unused ETA breakers, still sharp, still rated, waiting for the panel that needs them.
