WFCO 8700-AD & 8900-AD Approved Breaker and Fuse Guide

WFCO WF-8700-AD and WF-8900-AD power centres accept specific, manufacturer-tested residential-style AC circuit breaker families and standard ATC/ATO 12V blade fuses. The 30A shore-power main and 20A maximum AC branch ratings are separate from the converter's DC charging amperage. Use this model-focused reference to check the breaker types before choosing an exact part.

WFCO breakers versus DC fuses

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

30A 120V shore AC mainWF-8700-AD and WF-8900-AD panel mains
Manufacturer-listed AC breakersMain and branch positions must match panel label and circuit sizing
Protected AC loads120V branch circuits; converter power is a protected AC branch

12V DC fuse section

Converter/charger and battery12V distribution power source and protected battery connection
ATO / ATC blade fusesIndividual branch and reverse-polarity protection; use original specified ratings
DC appliancesLights, fans, water pumps and other rated circuits
Original functional illustration, not a physical breaker-placement drawing, a terminal pinout or a substitute for the specific unit's factory schematic.

WFCO approved breaker type list and fuse positions

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.

Do not mix the fuse and breaker sections. WFCO describes ATC/ATO automotive blade fuses (such as Littelfuse 257 or Bussmann ATC) for the 12V circuits and reverse-polarity protection. The WirthCo assortment below is a catalog source for the same blade-fuse format; it does not authorize a different amp rating or establish a specific WFCO-brand endorsement.

Find exact-model power centres, breakers and fuses

These catalog cards are reference points for the specific model or breaker type. A separate product card does not mean the component is already included in a boxed power centre.

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)

Electrical service safety: Disconnect shore, generator, inverter and battery power before service. AC breakers must be correctly listed and rated for their panel, and battery-fuse ratings must match wiring and load requirements. Have installation or replacement carried out by a qualified RV electrician.

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