Product Overview
Square D Class 9001 Light Module, Type MMB1 Series A, 120V 60Hz and 110V 50Hz
Condition
New. The black molded body carries a white legend reading LIGHT MODULE, TYPE MMB1, CL 9001, SERIES A, 120 V 60 HZ, 110 V 50 HZ, USE BULB 6 PSB, SQUARE D COMPANY, MADE IN U.S.A., with a boxed 80 beside the Square D logo. Fine surface scuffing and light scratches show across the black face under direct light, the kind of marking a loose part picks up sitting in a bin. The lamp socket is empty in the photos, its two flat contacts bright and gold-toned with no arcing or burn marks, and the molded body and mounting flange are intact. No bulb, lens cap, hardware, or packaging is included - the module in the photos is what ships.
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Product Overview
This is the light module from Square D's Class 9001 control station line, the black block that sits behind a pilot light or an illuminated pushbutton and holds the lamp. The label states the electrical story plainly: 120 V 60 HZ and 110 V 50 HZ, with USE BULB 6 PSB called out for the lamp itself. It is a Series A piece marked MADE IN U.S.A., from the era when Square D molded the class and type right into the face of the part so the next person opening the enclosure would not have to guess. Nothing beyond the printed label is confirmed here, so if your application depends on a rating that is not shown on the part, verify against Square D documentation before use.
Key Features
- Manufacturer: Square D Company, marked MADE IN U.S.A.
- Type: MMB1 light module
- Class: CL 9001
- Series: A
- Voltage and frequency per the label: 120 V 60 Hz, 110 V 50 Hz
- Lamp called out on the label: USE BULB 6 PSB (bulb not included)
- Two-contact lamp socket with flat gold-toned contact blades
- Black molded body with a mounting flange hole
- Boxed 80 marking beside the Square D logo on the label
- Condition: New
Applications
- Maintenance electrician bringing a dead pilot light back to life on a legacy Square D 9001 pushbutton station
- Panel rebuilder matching original 9001 hardware so a refurbished control cabinet still matches the drawings
- Machine rebuilder keeping period-correct indicator lights on older industrial equipment instead of cutting the panel for a modern lamp
- Facilities technician stocking spares for motor control centers and control stations still running 9001 gear
Frequently Asked Questions
What exactly is printed on the part?
The full label reads LIGHT MODULE, TYPE MMB1, CL 9001, SERIES A, 120 V 60 HZ, 110 V 50 HZ, USE BULB 6 PSB, SQUARE D COMPANY, MADE IN U.S.A., with a boxed 80 next to the logo. The first photo shows all of it, so you can read the module before you order it.
Is a bulb included?
No. The socket is empty in the second and third photos. The label calls for bulb 6 PSB, so source the lamp separately and confirm the type against your own module or Square D documentation before ordering one.
Will it fit my Square D control station?
It is a Class 9001 Type MMB1 Series A module, so it belongs to the 9001 family it is marked for. Fit in your specific station is not confirmed here - compare it against the module you are replacing and check the type designation on your existing part before buying.
Can I run it at 240V?
Not confirmed, and the label does not support it. The only ratings marked on the part are 120 V at 60 Hz and 110 V at 50 Hz. Treat anything outside that as unverified and check Square D documentation before applying it.
Why buy this one module instead of chasing a used control station to strip?
Because this one is already out of the panel, already identified, and photographed from three sides. You can read the type, class, series, and voltage off the label yourself before you commit, instead of bidding on a surplus pushbutton station and hoping the light module inside is the one you need and still intact. Four are on the shelf. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Somebody at Square D stamped a boxed 80 on this label and sent it off to spend its working life behind a panel door, telling an operator at a glance that the circuit was live. Drop a 6 PSB in the socket and give it that job back.
