Liftmaster K74-50282, SWITCH CHANNEL, Q408
The LiftMaster K74-50282 is the Q408 switch channel used in select LiftMaster / Elite commercial gate operators. It may also be described as an electronic power strip. In practical service terms, this component is part of the internal electrical control area and helps support the proper routing or connection of operator wiring in machines designed for this Q408 assembly.
Fitment should be confirmed carefully because older Elite operators used multiple Q-number service parts in the same control area. Q408 is not the same item as Q400 maglock adapter, Q403 e-box assembly, Q310 surge protector, or a main Omni board. If the switch channel is burnt, cracked, corroded, or has loose terminals, the technician should also check for shorts, failed accessories, water intrusion, or incorrect wiring before simply replacing the part.
Compatible With
- Select LiftMaster / Elite SL3000, SL3000U, and SL3000UL slide gate operators using Q408
- Select LiftMaster / Elite CSW200, CSW200U, and CSW200UL swing gate operators using Q408
- Internal e-box/control area applications where the parts diagram specifies K74-50282 or Q408
- Not a replacement for Q400, Q403, Q310, Q410, main control boards, or limit switches
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Switch channel / electronic power strip |
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| Part Number | K74-50282 |
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| Application | Internal control/e-box electrical routing component |
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| Compatible Operator Type | Select LiftMaster / Elite SL3000 and CSW200 operator families |
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| Notes | Verify Q408 marking and wiring layout before ordering |
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Also Known As / Related Part Numbers
- K74-50282
- 74-50282
- Q408
- Elite Q408
- Switch channel
- Electronic power strip
- Power strip switch channel
Technician Note
Match this replacement part to the original part number, operator model, and parts diagram. LiftMaster and Elite service parts often look similar across operator families, but small differences in mounting, wiring, generation, voltage, or mechanical layout can make them non-interchangeable.
Before Ordering Checklist
- Confirm the operator model and model suffix on the nameplate.
- Compare the existing part number, Q number, or old reference number when available.
- Review the operator parts diagram for the exact assembly location.
- Check for damage that may have caused the original part to fail, such as water intrusion, gate binding, worn chain, loose hardware, or incorrect wiring.
- For electrical parts, confirm voltage, control-board generation, grounding, and accessory wiring before installation.
Professional Advisory
Gate operator repairs can involve heavy moving gates, stored mechanical force, high voltage, and required entrapment protection devices. Do not bypass safety sensors, edge devices, interlocks, or emergency release requirements. When wiring, grounding, high-voltage diagnosis, or unsafe gate movement is involved, have the system serviced by a qualified gate technician.
Product Questions and Answers
What is the K74-50282 used for?
It is a Q408 switch channel or electronic power strip used in the internal electrical area of select LiftMaster / Elite commercial gate operators.
Which operator families commonly use Q408?
References commonly list SL3000, SL3000U, SL3000UL, CSW200, CSW200U, and CSW200UL where the parts diagram calls for Q408.
Is this the same as the main control board?
No. It is a switch channel / power strip component, not the main operator control board.
Can I replace Q400 or Q403 with this part?
No. Q400, Q403, and Q408 are different service parts. Match the original Q number and parts diagram.
What should be checked if the original switch channel failed?
Check for loose connections, corrosion, water intrusion, accessory shorts, and incorrect wiring before replacing the component.
