The 803685348 Main Power Switch is a genuine XCMG battery disconnect switch designed for GR series motor graders. This heavy-duty rotary switch isolates the battery from the entire electrical system, providing a safe method to disable power during maintenance, storage, or emergency situations. The 803685348 main power switch features silver-alloy contacts, a flame-retardant housing, and a removable key for security. Rated for 250A continuous and 1000A intermittent (5 seconds), this OEM switch ensures reliable disconnection even under full alternator load. Used as original equipment on XCMG GR2003, GR215, GR300, and GR350 graders, this switch directly replaces failed units without wiring modifications, preventing battery drain, electrical fires, and accidental starts.
The 803685348 Main Power Switch is manufactured to SAE J2594 standards, with a robust rotary mechanism that provides positive tactile feedback. The switch includes a removable key that can be withdrawn only in the OFF position, preventing theft and unauthorized operation. Its IP66 rating makes it resistant to high-pressure water jets and dust, ideal for harsh construction environments. Replacing a worn or intermittent power switch with the genuine 803685348 part restores reliable battery isolation, reducing parasitic drain and protecting the alternator from reverse current. Each switch is 100% tested for contact resistance, dielectric strength, and mechanical endurance (50,000 cycles).
Every 803685348 main power switch is laser-etched with the XCMG part number, current rating, and polarity markings. The housing is made of UL94 V-0 rated nylon, and the terminals are copper studs with stainless steel nuts. Whether you are replacing a switch that has become hard to turn or upgrading to a higher-quality unit, this genuine XCMG component ensures your grader’s electrical system can be safely disconnected. Keep a spare switch and key in your toolbox for emergency field replacement.
| Parameter | Specification |
|---|---|
| OEM Number | 803685348 |
| Product Name | Main Power Switch (Battery Disconnect Switch) |
| Brand | XCMG (Genuine OEM) |
| Switch Type | Single-pole, single-throw (SPST), rotary disconnect |
| Contact Rating (Continuous) | 250A @ 12/24V DC |
| Intermittent Rating (5 sec) | 1000A |
| Cranking Rating (30 sec) | 500A |
| Contact Resistance | ≤ 0.5 mΩ (initial) |
| Contact Material | Silver-cadmium oxide (AgCdO) |
| Terminal Type | Two M10 copper studs, 25mm spacing |
| Key Type | Removable only in OFF position (2 keys included) |
| Housing Material | Nylon 6/6, UL94 V-0 flame retardant |
| Sealing | IP66 (dust-tight, high-pressure water jets) |
| Operating Temperature | -40°C to +85°C |
| Mechanical Life | 50,000 cycles |
| Electrical Life (rated load) | 10,000 cycles |
| Mounting | Panel mount, 19mm hole, two M4 screws |
| Dimensions (Body L×W×H) | 65 mm × 65 mm × 55 mm (±2 mm) |
| Net Weight | 0.28 kg (9.9 oz) |
| Standards | SAE J2594, CE, RoHS, ISO 8846 (ignition protection) |
| Compatible Models | XCMG GR135, GR165, GR180, GR2003, GR215, GR300, GR350 |
| Warranty | 12 months / unlimited hours |
Genuine XCMG main power switches are critical for safety, battery protection, and theft prevention. Their robust silver contacts and sealed design outlast generic switches, ensuring reliable disconnection and peace of mind.
Aftermarket battery switches often use copper or brass contacts that oxidize and increase resistance, leading to voltage drop, heat generation, and eventual failure. The genuine 803685348 Main Power Switch from XCMG uses silver-cadmium oxide contacts that remain conductive even after thousands of cycles. Independent tests show that OEM switches maintain contact resistance below 0.5 mΩ after 10,000 cycles, while generic switches often exceed 5 mΩ after 2,000 cycles, causing a 0.5V drop at 250A – enough to affect starter performance. This reliability ensures your grader starts every time and the electrical system remains protected.
Each 803685348 main power switch is traceable to its production batch, with records of contact resistance, dielectric strength, and mechanical endurance testing. The switch body is molded with the XCMG logo and current rating. XCMG’s quality control includes 100% functional testing of the key mechanism, torque retention of terminal nuts, and a 100-cycle break-in test. Only switches that meet all specifications are shipped, ensuring a reliable, long-lasting battery disconnect for your grader.
Installing the 803685348 main power switch requires basic hand tools. Disconnect both battery terminals before starting. Choose a dry, accessible location on the grader’s firewall or battery box. Drill a 19 mm hole for the switch body and two 4.5 mm holes for the mounting screws. Insert the switch through the panel, secure with the provided lock ring, and fasten with two M4 screws. Connect the battery positive cable to one M10 stud, and the cable going to the starter/alternator to the other stud. Torque nuts to 12 Nm. Insert the key and rotate to ON – verify that the cab lights and instruments power up. In OFF position, all power should be off.
Inspect the 803685348 switch every 1,000 operating hours. Check for signs of heat damage (melted plastic, discolored terminals), corrosion, or difficulty turning the key. Clean terminals with a wire brush and apply dielectric grease. If the switch feels gritty or the key does not lock in the OFF position, replace immediately. Keep a spare switch and keys in your parts inventory – a failed main switch can leave the grader completely dead. For machines with dual batteries, ensure the switch is rated for the combined current; the 803685348 is suitable for 12V and 24V systems up to 250A.
A 24-month field study on 40 XCMG GR2003 graders compared genuine 803685348 main power switches against aftermarket switches. Graders with OEM switches had zero switch-related failures (stuck contacts, high resistance, key breakage) over 6,000 hours of operation. In contrast, aftermarket switches failed at an average of 1,200 hours, with common failures including melted terminals (due to high resistance), keys breaking, and internal contacts welding in the ON position. The OEM switches prevented battery drain during storage and eliminated parasitic loads, extending battery life by an average of 8 months per set.
Voltage drop measurements confirmed that the 803685348 switch maintains less than 50 mV drop at 250A, ensuring full alternator voltage reaches the battery. The IP66 sealing was validated by subjecting the switch to a 1000 psi pressure washer from 1 meter – no water ingress occurred. For graders operating in coastal or high-humidity areas, the silver-cadmium contacts resist sulfation, maintaining low resistance. The key’s anti-withdrawal feature (key removable only in OFF position) prevents accidental loss and ensures the switch cannot be left ON unintentionally during maintenance.
XCMG produces the 803685348 main power switch in an IATF 16949-certified facility using automated assembly. The contacts are welded onto copper studs using a resistance welding process, then silver-cadmium oxide is applied via powder metallurgy. The rotary mechanism is lubricated with low-temperature grease and assembled with a stainless steel cam. The housing is injection-molded from UV-stabilized nylon. Each switch undergoes a 100% dielectric test (1500V between terminals and case), contact resistance measurement (4-wire Kelvin method), and a 100-cycle mechanical test. Random samples are subjected to salt spray (500 hours) and thermal shock (-40°C to +85°C, 50 cycles).
All genuine 803685348 switches are individually packed in foam-lined boxes with two keys and mounting hardware. Bulk orders of 20 or more are palletized. XCMG maintains regional stock in Singapore, Houston, and Hamburg, enabling 48-hour delivery to most global destinations. For fleet operators, consignment stock and emergency air freight are available via the buttons above. A 12-month warranty against manufacturing defects is included.
The 803685348 main power switch directly replaces original XCMG part numbers 803685345 and 803685346. It is fully compatible with all GR series motor graders manufactured after 2008, including GR135, GR165, GR180, GR2003, GR215, GR300, and GR350. This switch is also used on certain XCMG wheel loaders (LW500KN) and bulldozers (TY230). For graders with remote battery disconnect (cable-operated), order the remote kit (803685349). Always verify the terminal orientation and panel thickness before ordering – the 803685348 fits panels up to 5mm thick.
When replacing a main power switch, also inspect the battery cables for corrosion or damage. XCMG recommends replacing the cable terminals if they are loose or corroded. Keep spare keys (part 803685350) in the cab for convenience – the switch includes two keys, but extras are recommended for fleet use. For machines with high-output alternators (200A+), the 803685348 is rated for 250A continuous, but consider adding a secondary switch for high-draw auxiliary circuits if total load exceeds 250A. Provide your grader’s serial number and a photo of the old switch when ordering to ensure correct fitment.
Investing in the genuine 803685348 main power switch reduces total operating costs through improved battery life, reduced parasitic drain, and theft prevention. A failed switch that welds in the ON position can cause a complete battery discharge overnight, damaging batteries and requiring jump-starts costing $200+ per incident. The OEM switch, priced competitively, eliminates this risk. Moreover, its 50,000-cycle mechanical life means it will outlast the machine itself. Fleet managers who switched to genuine XCMG switches reported a 90% reduction in battery-related service calls and a 60% decrease in electrical system troubleshooting time.
When you choose the authentic 803685348 main power switch, you also support sustainable manufacturing. XCMG uses lead-free materials, recyclable nylon, and silver from responsible sources. The switch’s long life reduces waste compared to cheap switches that need replacement every 2,000 hours. For reliability-focused and safety-conscious contractors, this genuine part is the responsible choice. To order, click the Send Email or Inquiry Now buttons above. Provide your grader’s model and serial number for accurate fulfillment. Genuine XCMG parts come with a 12-month warranty. Ensure your motor grader’s electrical safety and battery protection with the original XCMG 803685348 Main Power Switch – engineered for the most demanding conditions.
