When a WFCO power-centre breaker or fuse needs replacement, identify the power-centre label first. The 8700-AD and 8900-AD families have different physical DC fuse layouts, but their factory manuals list approved AC breaker types for a 30A 120V supply. This guide helps distinguish 120V breakers from 12V blade fuses and identifies the matching catalog parts.
Two different WFCO protection sections
Identify the panel's model and the electrical system before selecting components. An AC breaker operates on the shore-power side; an ATC/ATO blade fuse protects its separate 12V DC circuit.
120V AC breaker section
12V DC fuse section
Find the listed breaker family before buying
| Manufacturer | Approved 30A main types | Approved branch types (20A maximum) |
|---|---|---|
| Cutler-Hammer | BR, C | BR, C, BRD, BD, A |
| Thomas & Betts | TB, TBBD | TB, TBBD |
| ITE / Siemens | QP, QT | QP, QT |
| Square D | HOM, HOMT | HOM, HOMT |
| Murray | MP-T, MH-T | MP-T, MH-T |
| General Electric | THQL, THQP | THQL, THQP |
WFCO lists the approved breaker models for 120V / 30A maximum main service and 120V / 20A maximum branch circuits. The same general breaker family can have many individual catalog numbers; verify pole arrangement, interrupting rating, physical position and the exact breaker label on the installed panel. WFCO specifies 10,000A short-circuit current rating for replacement breakers and lists filler plates FP-01 or FP-01B for appropriate empty positions.
| WFCO panel | Main limit | Maximum branch positions | DC section distinction |
|---|---|---|---|
| WF-8725-AD | 30A AC main | Up to 3 AC branch circuits with duplex breakers | 8700-AD DC fuse layout varies by model |
| WF-8735-AD / WF-8740-AD | 30A AC main | Up to 5 AC branch circuits with duplex breakers | Separate 12V fuse positions and battery protection |
| WF-8900-AD | 30A AC main | Up to 9 AC branch circuits with duplex breakers | 11 DC branch positions; F10/F11 rated up to 30A |
On the 8900-AD 11-position DC board, WFCO identifies two higher-current positions (F10 and F11, maximum 30A) and nine positions rated to 20A maximum. These are limits, not recommended fuse sizes. Replace each fuse with the originally specified type and amperage for that wire and appliance.
Compare the original part number with product photos
Compare the breaker and power-centre markings to the separate products below before ordering. The illustrated listings are not universal replacement approvals.
Power centre model identification
Siemens QP family product references
These 15A, 20A and 30A single-pole QP examples are not interchangeable. A 30A main breaker does not mean a 30A branch circuit is allowed; actual permitted ratings are in the model table above.
ATO / ATC 12V blade-fuse assortment
Original manufacturer breaker and fuse drawings
The WFCO manuals include a 120V AC breaker approval list and detailed AC/DC component illustrations. Their factory documents, not this simplified diagram, define breaker positions and reverse-polarity fuse locations.
WFCO 8700-AD factory approved breaker and fuse table (PDF, p. 3–4) · WFCO 8900-AD approved breaker list and DC fuse diagram (PDF, p. 3–4)