MFB12-37YC / MFZ12-37YC Solenoid Valve Coil — 30W, AC/DC Multi-Voltage

Generic 3rd-Party Solenoid Coil · MFB / MFZ Series · 12 mm ID × 37 mm Height · 30 W

The MFB12-37YC and MFZ12-37YC are general-purpose, third-party (generic) replacement solenoid valve coils designed for pneumatic and fluid-control valves used in factory automation. The MFB prefix designates the square / DIN-style connector housing; the MFZ prefix designates the lead-wire (flying-lead) variant. Both share the same 12 mm inner bore × 37 mm height geometry and the same 30 W continuous-duty winding family, so they fit valve spools with the matching armature tube dimensions and produce equivalent magnetic pull at the same voltage.

KOEED sources this coil family as a cost-effective, drop-in spare for Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic and KEYENCE production lines that run Chinese-built pneumatic manifolds, as well as many Asian valve manufacturers whose spool geometry follows the same 12 mm / 37 mm convention. Send your BOM to Moritta@KOEED.COM and we will reply with stock and price within 24 hours.

Key Technical Specifications & Overview

The “YC” suffix is a continuous-duty 30 W winding code used across many Chinese solenoid families; it is electrically and dimensionally interchangeable with coils marked 30 W / 30 W-S1 in OEM catalogs. See our solenoid valve coil collection for related 27 mm, 39 mm and 50 mm height variants and AC220V / DC24V sub-models.

Application Scenarios & Where It Fits

The 12 × 37 mm 30 W coil format is one of the most common footprints in Asian-built pneumatic equipment, which is why it shows up in factories running Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic and KEYENCE control systems. The MFB12-37YC / MFZ12-37YC is a direct drop-in for:

• Pneumatic valve manifolds on assembly cells, indexing tables and pick-and-place stations.
• Water and oil solenoid valves on small-bore fluid-control skids in process lines.
• Low-power pneumatic cylinders driving clamps, gates, diverters and small actuators.
• Machine-tool automation — coolant valves, chip-flush air, hydraulic pilot circuits.
• Packaging and bottling lines where 24 V DC and 220 V AC supply rails coexist.
• End-of-line test rigs and laboratory benches where a generic 30 W coil is the most flexible spare.
• Refurbishment of imported equipment that originally shipped with Asian-built valves whose OEM coils are now out of stock at the original manufacturer.

Browse the pneumatic components collection for matching valve bodies, manifolds and FRLs, or the factory automation category for related control hardware.

Integration & Wiring Notes

Wiring is the most common failure point on this format. The two connector variants differ in how they land in your cabinet, and the two winding types (AC vs DC) need very different driving circuits. Please confirm the following with your panel builder before installation:

• Voltage rail — match exactly: AC220V / AC110V versions cannot be swapped onto a 24 V DC bus, and a DC24V coil on an AC rail will overheat within minutes. We can help cross-check your BOM if you are migrating from one rail to another.
• Connector keying (MFB) — the square DIN-style plug is keyed to the coil body; do not force a different orientation. Pin-out is polarity-insensitive on AC coils, polarity-sensitive on DC coils.
• Lead-wire (MFZ) — the lead-wire variant terminates to flying leads ≈ 300 mm; use crimped ferrules and strain relief at the cable gland. DC variants must observe the marked + / − polarity.
• Surge suppression — for DC coils, pair with a flyback diode (1N4007 or equivalent) across the coil terminals to protect upstream PLC outputs. For AC coils, an RC snubber is recommended if the coil is switched by a solid-state relay.
• Duty cycle — rated 30 W continuous; if your application is high-cycle (e.g. > 60 cpm), verify the actual average power dissipation and ventilation, or step down to a 14 W / 22 W variant in the same solenoid coil family.
• Sealing — IP65 is only achieved with the connector fully seated and the gasket uncompressed. In wash-down or outdoor cabinets, route the cable downward so water cannot pool at the gland.

For PLC-side wiring of the switching output, see the PLC Error Code Database and the PLC Analog Calculator tools if you need to convert 4–20 mA control signals to pneumatic pressure setpoints.

Installation & Commissioning Tips

A correct 5-minute install is what separates a coil that lasts 5 years from one that fails in a week. The 12 mm bore format is forgiving on geometry, but the sealing surfaces and the mounting nut are not. The list below is the field checklist our KOEED engineers use during commissioning visits to lines running Allen-Bradley and Siemens controls:

• Confirm the armature tube is clean — debris, oil residue or a previous coil’s thread-locker can prevent the new coil from seating flat. Wipe with isopropyl alcohol and let dry.
• Mount the coil, then the nut — slide the coil straight over the tube until it bottoms out; then hand-thread the retainer nut before using a tool. Over-torque cracks the housing.
• Check the gasket — replace the gasket if the previous coil was leaking. Re-used gaskets are the single most common cause of IP65 failures we see in warranty returns.
• Energise briefly before reassembly — apply rated voltage for ≈ 1 s and listen for a clean pull-in click. A weak or absent click points to a wrong voltage, a damaged armature or a missing plunger spring inside the valve body.
• Verify polarity on DC variants — a DC coil will still pull in on reversed polarity, but the diode on the surge-suppression path will short-circuit and the coil will burn out within hours.
• Temperature check after 30 min — a healthy 30 W continuous-duty coil reaches ≈ 60–80 °C at the winding. If it stays cold, the armature is not pulling in fully; if it is too hot to touch, the duty cycle is over-rated or the supply voltage is wrong.
• Label the cable — tag the connector with the part number (MFB12-37YC or MFZ12-37YC) and voltage, so the next maintenance engineer does not swap an AC110V coil onto a DC24V rail.

If commissioning throws an unexpected fault code on the upstream PLC, the AI Diagnostic Tool can read a photo of the nameplate and suggest a replacement or a compatible variant.

Procurement, Warranty & Lead Time

KOEED keeps the MFB12-37YC and MFZ12-37YC families in stock across all six voltage variants (AC220V, AC110V, DC24V, DC12V, DC48V, DC60V, DC72V). Single-piece and full-BOM orders are both welcome; pricing is RFQ-based so we can reflect current raw-material and freight costs rather than list a number that will be wrong next month. The process is the same one we use for Allen-Bradley, Mitsubishi and KEYENCE spares:

• Quote within 24 hours — send your part list to Moritta@KOEED.COM and we will reply with stock, price and freight on the next business day.
• Worldwide shipping — DHL / FedEx / UPS for cross-border orders, with tracking forwarded as soon as the label is created.
• Warranty — 12 months against manufacturing defect; DOA units are replaced rather than repaired, because coil-class parts are not field-serviceable.
• Custom specs — if your project needs a voltage or lead length not in the standard list, we can source a custom winding run. Typical lead time is 3–4 weeks, with a sample unit available first.
• BOM-level quotation — if your panel also needs Siemens PLCs, Omron HMI, Schneider power supplies or Panasonic sensors, send the full list — one shipment, one invoice, one point of contact.
• Hard-to-find support — if the 12 mm bore coil is wrong for your valve, the AI Diagnostic Tool can identify a compatible alternative from the same family, or our team can source a discontinued Fanuc / Yaskawa footprint on request.

For terms, see our Return Policy, Shipping Policy and Terms of Service. Real-time outbound records are visible on the Real-Time Records page.

Browse the full All collection or jump back to the KOEED home page for the nine-brand matrix, daily PLC news and live sales records. Questions about this part, or a coil variant you cannot find anywhere else? Email Moritta@KOEED.COM — we answer within 24 hours on business days.