Product Description
Mitsubishi MI 1009544 ignition key switch for electric lift trucks features panel-mount rotary design, 3-position electrical contacts rated 10A at 24VDC, removable double-cut key, and nickel-plated brass housing. OEM replacement for Mitsubishi electric forklift applications.
Specifications
Electrical
| Contact Rating | 10A at 24VDC |
| Voltage | Rated 24VDC operating voltage |
| Number of Positions | 3-position (Off, On, Start) |
| Number of Terminals | 4 screw terminals |
Material & Construction
| Switch Body Material | Nickel-plated brass housing |
| Key Material | Nickel-plated steel |
Part Numbers
| OEM Part Number | MI 1009544 |
| Manufacturer Part Number | 1009544 |
Frequently Asked Questions
Q: What is the MI 1009544 ignition key switch and what are its specifications?
A: The MI 1009544 is an OEM Mitsubishi ignition key switch for electric lift trucks. It is a panel-mount rotary switch with a nickel-plated brass housing, 3-position electrical contacts (Off, On, Start), and 4 screw terminals. The switch is rated 10A at 24VDC operating voltage and accepts a removable double-cut key for starting and shutting down the truck.
Q: Which Mitsubishi electric lift truck models use the MI 1009544 key switch?
A: The MI 1009544 is compatible with Mitsubishi electric forklift and pallet lift truck models operating at 24VDC system voltage. Verify your equipment model and voltage rating before ordering. The switch connection points and terminal count must match the original equipment wiring to ensure proper start, run, and stop functionality.
Q: What is the electrical contact rating and operating voltage of the MI 1009544?
A: The MI 1009544 key switch has a contact rating of 10A at 24VDC, which means it can safely switch control signals up to 10 amps on a 24-volt direct current system. This rating is sufficient for powering solenoids, relays, and control circuits on electric lift trucks. Do not exceed the rated current or voltage, as this causes contact welding and switch failure.
Q: What are the 3 positions on the MI 1009544 and how do they function?
A: The MI 1009544 has three key positions: Off (all circuits de-energized), On (12-volt or 24-volt circuits energized for lights, horn, and accessories), and Start (high current draw position that engages the motor contactor and starter relay). Turning the key to each position activates different electrical circuits required for normal truck operation.
Q: What material and finish does the MI 1009544 housing and key have?
A: The MI 1009544 switch body is nickel-plated brass, providing corrosion resistance in wet lift truck environments. The key is also nickel-plated, preventing rust and ensuring smooth operation. The brass housing helps dissipate heat generated by electrical contacts during high-current switching. Avoid substituting plastic-housing switches unless specifically rated for industrial lift truck use.
Q: How long does the MI 1009544 key switch typically last and when should it be replaced?
A: A properly maintained MI 1009544 switch lasts 5 to 10 years or longer depending on operator key-turning habits and environmental exposure. Replace the switch if the key becomes difficult to turn, the contacts fail to energize circuits, the key will not stay in the Start position, or if corrosion is visible inside the switch housing. A failing key switch prevents the truck from starting or shutting down properly and creates operator safety hazards.