Sierra MP41040 Ignition Switch, 4-Position Conventional, 15 Amp, Knurled Black Plastic Cap
Sierra MP41040 Ignition Switch, 4-Position Conventional, 15 Amp, Knurled Black Plastic Cap
The Sierra MP41040 is a 4-position conventional marine ignition switch built for panel mounting on boats that need Accessory, Off, Run, and Start functions from a single switch. The switch body is constructed of polyester for resistance to the harsh marine environment, while the visible face nut is a knurled black plastic design fitted with a rubber cap to help keep moisture out of the switch mechanism. A brass back-up nut secures the switch to the panel from behind.
Electrically, the MP41040 is rated for three separate circuits: 15 Amp at 12 VDC on the ignition circuit, 30 Amp at 12 VDC on the solenoid circuit, and 15 Amp at 12 VDC on the accessory circuit, giving it enough capacity to handle ignition, starter solenoid engagement, and accessory loads through the same key switch. Termination is via 4 screw tab terminals, making wiring straightforward during installation or a switch replacement.
The switch mounts through a 7/8 inch panel hole and is built with a long shaft, accommodating panels up to 1 1/8 inch maximum thickness. This makes the MP41040 a straightforward drop-in replacement for boats with a matching 4-position, 4 screw tab ignition switch layout.
Specifications
- Brand: Sierra
- Manufacturer Part Number: MP41040
- Switch Type: Ignition Switch
- Number of Positions: 4
- Operation Mode: Acc - Off - Run - Start
- Terminal Type: 4 Screw Tab
- Ignition Circuit Rating: 15 Amp at 12 VDC
- Solenoid Circuit Rating: 30 Amp at 12 VDC
- Accessory Circuit Rating: 15 Amp at 12 VDC
- Material: Polyester
- Back Up Nut: Brass
- Face Nut: Knurled black plastic with rubber cap
- Mounting Hole Size: 7/8 inch
- Shaft Length: Long, 1 1/8 inch maximum panel thickness
- Contact Type: Normally Closed
- Fit Type: Universal Fit
- Weight: 0.28 pounds
- UPC: 808282367732
Fitment
Universal fit for marine vehicles using a 4-position, 4 screw tab ignition switch with a 7/8 inch mounting hole and up to 1 1/8 inch panel thickness.
Replaces (OEM)
No specific OEM cross-reference numbers are listed for the MP41040.
Frequently Asked Questions
What are the 4 positions on the Sierra MP41040 ignition switch? The MP41040 operates through Accessory, Off, Run, and Start positions, giving a single conventional switch full control of ignition, accessory power, and engine starting.
What is the amp rating of the MP41040 ignition switch? The ignition and accessory circuits are each rated 15 Amp at 12 VDC, while the solenoid circuit is rated 30 Amp at 12 VDC on the Sierra MP41040.
What size mounting hole does the MP41040 require? A 7/8 inch panel hole is needed to install the Sierra MP41040 ignition switch.
What is the maximum panel thickness for this switch? The MP41040 uses a long shaft rated for panel thickness up to 1 1/8 inch maximum.
What material is the Sierra MP41040 switch body made of? The switch body is made of polyester, with a brass back-up nut and a knurled black plastic face nut fitted with a rubber cap.
Is the face nut on the MP41040 waterproof? The knurled black plastic face nut includes a rubber cap to help protect the switch mechanism from moisture, though no IP waterproof rating is specified for this switch.
What type of terminals does the MP41040 use? The Sierra MP41040 uses 4 screw tab terminals for wiring connections.
Does the MP41040 fit any specific boat make or engine? The Sierra MP41040 is a universal-fit ignition switch designed for marine vehicles using a standard 4-position, 4 screw tab, 7/8 inch hole switch configuration rather than a single make-specific fitment.
How much does the MP41040 ignition switch weigh? The Sierra MP41040 weighs 0.28 pounds.
What is included with the Sierra MP41040? The MP41040 is supplied as a single 4-position conventional ignition switch with its back-up nut and knurled black plastic face nut with rubber cap already assembled.
Is the MP41040 a Normally Closed or Normally Open switch? The Sierra MP41040 is a Normally Closed contact type ignition switch.
Can the MP41040 handle the starter solenoid circuit directly? Yes, the solenoid circuit on the Sierra MP41040 is rated 30 Amp at 12 VDC, in addition to the 15 Amp ignition and accessory circuits.