How many amps can Switch Pros SP-9100 handle?

The SP-9100 handles 125 amps total across all eight circuits combined. Circuits 1–4 support a maximum of 20 amps each; circuits 5–8 support a maximum of 35 amps each. High-draw loads like winches must use a relay triggered by an SP-9100 output — the winch draws directly from the battery through the relay, not through the SP-9100 circuit.

Can I run two LED light bars on one SP-9100 circuit?

Yes, but it depends on which circuit you use. Circuits 1–4 are capped at 20A — two light bars on one of these circuits cannot exceed 17A combined (85% of circuit capacity). Circuits 5–8 are capped at 35A — two light bars on one of these circuits cannot exceed approximately 30A combined. Verify the combined wattage from both bars' spec sheets (Watts ÷ 12V = Amps) before committing to this configuration. Use a small fuse block at the circuit output to protect each bar individually with appropriately sized blade fuses.

What happens if I exceed the SP-9100 circuit amperage limit?

The SP-9100's thermal protection trips the affected circuit and cuts power to the load. The circuit resets after the module cools. Repeated trips indicate the programmed limit is below the actual accessory draw — adjust the threshold in the Switch Pros app or investigate the accessory for a fault.

How do I calculate amp draw for my accessories?

Pull the wattage from each accessory's spec sheet and divide by 12: Watts ÷ 12V = Amps. For example, a 240W light bar draws 20A. Always use the spec sheet wattage — never estimate. Once you have the amp draw for each circuit, set the SP-9100 overcurrent threshold 15–20% above that number. For an accessory drawing 10A, set the threshold to 12A.

Which SP-9100 circuits are best for high-draw accessories?

Circuits 5–8 support 35 amps each — assign air compressors, high-wattage light bars, and other high-draw accessories to these circuits. Circuits 1–4 are limited to 20 amps each and are appropriate for rock lights, whip lights, cameras, intercoms, and other lower-draw accessories. High-draw inductive loads (compressors, pumps) still require a relay even on the 35A circuits per Switch Pros specification.

Switch Pros SP-9100 Load Planning for Can-Am X3: Lights, Winch, Air Compressor, and Circuit Assignment

June 23, 2026

The Switch Pros SP-9100 supports 125 amps total across eight circuits. Circuits 1–4 are limited to 20 amps each; circuits 5–8 are limited to 35 amps each. Before mounting and wiring the SP-9100, you need to know the actual current draw of every accessory you plan to connect so you can allocate circuits correctly and avoid tripping thermal protection under load. This article walks through the process of building an accurate load plan for a Can-Am X3 accessory build.

SP-9100 Capacity Numbers

Total system capacity: 125 amps across all eight active circuits simultaneously
Maximum per circuit (circuits 1–4): 20 amps each
Maximum per circuit (circuits 5–8): 35 amps each

125 amps total does not mean 125 amps available for any single circuit — it means the combined draw of all eight circuits simultaneously cannot exceed 125 amps.

Typical Accessory Amp Draw Reference

LED light bar (30-50 inch): 5–12A depending on LED count and brand
Rock lights (set of 8): 2–6A total
Whip lights (2x): 1–3A total
LED pod lights (pair): 2–6A depending on wattage
Air compressor (portable 12V): 15–25A peak, 8–15A sustained
Intercom / radio: Varies by model — verify from the product's datasheet
Heated seats (pair): 5–10A on high setting
Dash cam / camera system: 0.5–2A
Winch: 200–400A under load — do NOT wire directly to SP-9100 (see below)

Always verify amp draw on the actual product spec sheet — these ranges vary significantly between manufacturers and product tiers.

When You Must Use a Relay

There are four scenarios where a relay is required rather than wiring an accessory directly to an SP-9100 output. Switch Pros specifies the first three; the fourth is a Reed Made Speed recommendation for radio installations:

1. Load Exceeds 85% of Circuit Capacity

Switch Pros recommends not loading any circuit above 85% of its rated capacity. For a 20A circuit (circuits 1–4), that means no more than 17A sustained draw. For a 35A circuit (circuits 5–8), no more than 29.75A. If your accessory exceeds 85% of the circuit's rating, wire it through a relay sized for the load, triggered by the SP-9100 output.

2. Inductive Loads — Compressors, Pumps, Large Fans

Inductive loads generate a voltage spike when switched off that can damage solid-state switching components over time. Switch Pros explicitly states that compressors, pumps, and large fans should use a relay in-line. The SP-9100 output triggers the relay coil (under 1A draw); the relay contacts carry the compressor load directly from the battery. This protects the SP-9100's solid-state outputs from inductive spike damage.

3. VHF Radio Push-to-Talk (PTT)

If you want to use a Switch Pros button as the push-to-talk trigger for a VHF radio, a relay is required. The SP-9100 output sends switched 12V power when a circuit activates. VHF radios use a PTT input that transmits when the PTT wire is momentarily shorted to ground — the opposite signal type. A relay bridges this mismatch: the SP-9100 output energizes the relay coil, the relay's normally-open contacts close and connect the radio's PTT wire to ground, and the radio transmits. Program the SP-9100 circuit to momentary mode to match the expected PTT behavior. The relay coil draws less than 1A — well within any SP-9100 circuit rating.

4. Winch

A winch under load draws far beyond what the SP-9100 can handle directly. Wire the winch to a dedicated high-amperage relay connected directly to the battery. Use one SP-9100 circuit output as the relay coil trigger (relay coil draws approximately 0.5–1A). When the SP-9100 switch is pressed, it energizes the relay coil, which closes the high-amperage relay contacts, which powers the winch directly from the battery — keeping the winch's amperage completely off the SP-9100's circuits.

Building Your Load Plan

Before buying or wiring, list every accessory with its sustained amp draw (not peak). To calculate amp draw from a product's wattage rating: Watts ÷ 12V = Amps (e.g., a 300W light bar draws 25A). Always pull the wattage from the product's spec sheet — do not estimate. Sum the draws of circuits that will run simultaneously — this is your realistic combined load. Compare that number to the SP-9100's 125A total capacity. Do not load any circuit above 85% of its rated capacity.

Example Load Plan:

Circuit 1 — Front light bar: verify from product wattage ÷ 12
Circuit 2 — Rear chase bar: verify from product wattage ÷ 12
Circuit 3 — Rock lights: verify from product wattage ÷ 12
Circuit 4 — Whip lights: verify from product wattage ÷ 12
Circuit 5 — Air compressor relay trigger: <1A (compressor wired through relay per Switch Pros inductive load requirement)
Circuit 6 — Winch relay trigger: <1A
Circuit 7 — Intercom: verify from product spec sheet
Circuit 8 — Heated seats: verify from product spec sheet

Circuit Prioritization for Programming

Once the SP-9100 is wired, program the most frequently used circuits to the most ergonomically accessible switch positions — the switches you hit most in motion should be at the top of the panel where reach and identification is fastest. Program circuits you only use at a stop (air compressor, heated seats) to the lower positions.

If You Need More Than Eight Circuits

If your accessory count exceeds eight, the Switch Pros SP-RCR Force-12 provides 12 circuits at 150A total. Each accessory gets its own solid-state protected circuit — no blade fuse sub-panels, no additional relay points. See the Reed Made Speed SP-RCR mount if the Force-12 is the right fit for your build.

Frequently Asked Questions

How many amps can Switch Pros SP-9100 handle?: The SP-9100 handles 125 amps total across all eight circuits combined. Circuits 1–4 support a maximum of 20 amps each; circuits 5–8 support a maximum of 35 amps each. High-draw loads like winches must use a relay triggered by an SP-9100 output — the winch draws directly from the battery through the relay, not through the SP-9100 circuit.
Can I run two LED light bars on one SP-9100 circuit?: Yes, but it depends on which circuit you use. Circuits 1–4 are capped at 20A — two light bars on one of these circuits cannot exceed 17A combined (85% of circuit capacity). Circuits 5–8 are capped at 35A — two light bars on one of these circuits cannot exceed approximately 30A combined. Verify the combined wattage from both bars' spec sheets (Watts ÷ 12V = Amps) before committing to this configuration. Use a small fuse block at the circuit output to protect each bar individually with appropriately sized blade fuses.
What happens if I exceed the SP-9100 circuit amperage limit?: The SP-9100's thermal protection trips the affected circuit and cuts power to the load. The circuit resets after the module cools. Repeated trips indicate the programmed limit is below the actual accessory draw — adjust the threshold in the Switch Pros app or investigate the accessory for a fault.
How do I calculate amp draw for my accessories?: Pull the wattage from each accessory's spec sheet and divide by 12: Watts ÷ 12V = Amps. For example, a 240W light bar draws 20A. Always use the spec sheet wattage — never estimate. Once you have the amp draw for each circuit, set the SP-9100 overcurrent threshold 15–20% above that number. For an accessory drawing 10A, set the threshold to 12A.
Which SP-9100 circuits are best for high-draw accessories?: Circuits 5–8 support 35 amps each — assign air compressors, high-wattage light bars, and other high-draw accessories to these circuits. Circuits 1–4 are limited to 20 amps each and are appropriate for rock lights, whip lights, cameras, intercoms, and other lower-draw accessories. High-draw inductive loads (compressors, pumps) still require a relay even on the 35A circuits per Switch Pros specification.

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