Description
Product Overview
The Fuji Electric FMC-OASZ42 3A1B is an industrial electrical switching component associated with Fuji Electric’s FMC contactor family. It is used in control-circuit applications where auxiliary contacts provide switching signals for interlocks, status feedback, and control logic. The 3A1B designation generally denotes three normally open contacts and one normally closed contact, although the actual contact arrangement should be confirmed from the markings and terminal diagram on the supplied unit. Correct identification is important when replacing a component in an established electrical panel, since contact arrangement and coil requirements affect circuit operation.
When evaluating the Fuji Electric FMC-OASZ42 3A1B for a maintenance or replacement project, engineers should compare the complete model designation, coil voltage, contact configuration, rated operational current, and applicable utilization category. Published information for a related FMC-0 (3A1B) version references 200–240 V and 2.2 kW, along with an AC1/thermal current figure of 18 A. These figures should not be treated as universal ratings for every FMC-OASZ42 variant; confirm the exact device label and manufacturer documentation before selecting it for a load.
The Fuji Electric FMC-OASZ42 3A1B may be relevant to maintaining legacy machinery and electrical control assemblies where the original contactor configuration must be preserved. Before installation, inspect the terminals and contact surfaces, check coil compatibility, and verify the operation of each auxiliary contact. If the original component is discontinued or difficult to source, a proposed substitute should be evaluated against the complete electrical and mechanical requirements rather than selected by appearance alone.
Product Introduction
A contactor replacement can create control faults when the coil voltage or auxiliary contact arrangement differs from the original. The Fuji Electric FMC-OASZ42 3A1B is associated with a three-normally-open, one-normally-closed contact configuration, making terminal-level verification important before commissioning.
For maintenance teams sourcing an FMC-OASZ42 auxiliary relay or contactor, confirm the coil rating, load duty, mounting dimensions, and terminal layout against the installed component. This helps reduce wiring changes and prevents selecting a part with incompatible switching characteristics.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Fuji Electric |
| Model | 3A1B |
| Product Type | Magnetic contactor / auxiliary relay assembly |
| Product Family | FM |
| Contact Arrangement | 3A1B designation; commonly 3 NO + 1 NC, verify terminal diagram |
| Coil Voltage | Requires exact nameplate confirmation |
| Rated Operational Voltage | Verify the exact variant and duty category |
| Rated Current | A related FMC-0 listing reports 18 A AC1/thermal current; confirm applicability |
| Motor Rating | A related FMC-0 listing reports 2.2 kW; confirm voltage and duty conditions |
| Mounting Method | Confirm against the physical unit and panel arrangement |
| Terminal Layout | Verify from device markings or wiring diagram |
| Operating Temperature | Not verified for the exact variant |
| Protection Rating | Not verified for the exact variant |
| Condition | Confirm as new, used, or tested refurbished |
The available technical listing covers an FMC-0 (3A1B) version and may not establish every rating fo variants. Use the exact nameplate and applicable Fuji Electric documentation for final selection.
FMC-OASZ42 3A1B
Related Products
The following items are related variants or components within the same general contactor and relay category. Verify electrical and mechanical compatibility before substitution.
- 2A2B — Variant with a different auxiliary contact arrangement; suitable only where the circuit requires that configuration.
- 4A — Variant identified with a 4A contact designation; verify the terminal arrangement before considering it.
- 3A1B 100–110 VAC — Listed variant associated with a 100–110 VAC specification; confirm whether this describes the coil or another electrical characteristic before ordering.
- FMC-0 (3A1B) — Related Fuji Electric contactor designation with published electrical data for a particular version.
- FMC-3-1A1B/1 — Fuji Electric contactor model identified in product documentation; verify dimensions, ratings, and coil specifications before substitution.
- Fuji Electric magnetic contactors — Other models may be suitable for switching duties, but require a full load, coil, and auxiliary-contact comparison.
- Matching auxiliary contact blocks — May support additional control signals when compatible with the contactor’s mechanical interface and electrical ratings.
Frequently Asked Questions
1. What is the Fuji Ele 3A1B used for?
It is associated with industrial contactor and auxiliary switching applications. Typical control functions include interlocking, status feedback, and switching signals within electrical panels and machinery.
2. What does 3A1B mean on this model?
It commonly indicates three normally open contacts and one normally closed contact. Confirm the actual contact diagram printed on the device before wiring, since the suffix alone should not replace terminal verification.
3. Can I replac 3A1B with the 2A2B version?
Not as a direct substitution without reviewing the control circuit. The contact arrangements differ, which can affect interlocks and feedback signals. Check the wiring diagram and all contact requirements before changing variants.
4. What coil voltage doe 3A1B require?
The exact coil voltage has not been reliably established for every variant. Read the coil marking on the installed unit and match it to the replacement. Do not infer coil voltage from a general product-family rating.
5. Can I hot-swap this contactor or relay?
No. Do not remove or replace it while energized unless the specific equipment and approved procedure explicitly permit that operation. Isolate the relevant power sources and verify the circuit is de-energized before servicing.
6. How can I verify the authenticity and condition of a replacement?
Check the Fuji Electric markings, complete model code, contact diagram, coil label, and physical condition. Ask for inspection or functional-test evidence, especially for used or refurbished units. Packaging or appearance alone does not prove operating condition.
7. Wil 3A1B retain my existing electrical configuration?
The component does not retain a software configuration in the way a programmable controller does. The existing wiring and circuit behavior depend on the correct coil, contact arrangement, ratings, and terminal connections. Photograph and document the wiring before removal, then test the control sequence after installation.
