Product Overview
E-T-A 3120-F621-P7T1 Snap-In Thermal Switch 250VAC 28VDC
Condition
Unused new old stock. Label markings legible: 3120-F621-P7T1-R12L, 2.5 A, AC250V DC28V, B4, with UR, CSA, and VDE approval marks. Clean terminals and undamaged plastic snap-in housing. Sold individually.
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Product Overview
Combining overcurrent protection and ON/OFF switching into a single compact panel unit, this device handles equipment power control with built-in thermal safety. Engineered with a trip-free mechanism, internal contacts remain open during an overload state even if an operator manually forces or holds the rocker paddle in the ON position. Marked paddle displays ON and I at the top with O and OFF at the lower edge. Gold-tone spade terminals provide standard quick-connect wiring for industrial enclosures, marine switchboards, and instrumentation panels.
Key Features
- Current rating: 2.5 A continuous thermal trip protection
- Voltage rating: 250 VAC, 28 VDC
- Trip-free safety mechanism prevents override during persistent overload conditions
- Snap-in bezel designed for rectangular panel cutouts
- Translucent white paddle marked with ON / | and O / OFF legends
- Quick-connect spade blade terminals for push-on wiring
- Molded housing bears manufacturer mark E-T-A and Germany designation
- Agency approval markings include UR (cURus), CSA, and VDE
Applications
- Isolates and protects sensitive instrument power circuits from overcurrent damage
- Replaces failed power switches in lab power supplies, test benches, and machine control panels
- Provides dedicated fused switching in marine panels and custom electrical enclosures
- Serves as integrated switch protection for audio amplifiers and workshop equipment
Frequently Asked Questions
Does this unit function as both a power switch and a circuit breaker?
Yes. The 3120-F series integrates manual power switching with automatic thermal overload disconnection in a single panel-mounted device.
What terminals are fitted on the base of this unit?
The unit features male quick-connect blade spade terminals on the underside for slide-on wire connectors.
What does the trip-free rating mean during an electrical fault?
Trip-free means the internal mechanism will trip and disconnect the electrical circuit even if the external paddle is physically held in the ON position.
Can this device be used in direct current circuits?
Yes. Label markings confirm it is rated for up to 28 VDC as well as 250 VAC line voltages at 2.5 A.
Clean German engineering that handles power switching and circuit safety in a single clean panel cut. Wire it in, snap it tight, and let the thermal trip watch your circuit.
