LiftMaster Electrical Box Parts — MGJ Operators
Genuine replacement parts for the electrical box fitted to LiftMaster MGJ medium-duty gear-reduced jackshaft operators. The transformer is voltage specific — check the model number on the operator's data label before ordering.
Parts marked no longer available have been discontinued and are listed for identification only.
Complete Electrical Boxes
| Model |
Part # |
Description |
| MGJ5011 |
K-MGJ5011 |
Electrical Box, 115V |
| MGJ5023 |
K-MGJ5023 |
Electrical Box, 230V |
| MGJ5025 |
K-MGJ5025 |
Electrical Box — now supplied as the K-MH5025L |
| MGJ5038 |
K-MGJ5038 |
Electrical Box (no longer available) |
| MGJ5043 |
K-MGJ5043 |
Electrical Box, 460V (no longer available) |
Box Components
| Ref |
Part # |
Description |
| 1 |
03-11112 |
Reversing Contactor — use the K03-8024-K |
| 2 |
10-11403 |
Electrical Box Cover |
| 3 |
10-11420M1 |
Electrical Box |
| 4 |
10-11421 |
Capacitor Clamp |
| 5 |
21-5115 |
Transformer, 115V — MGJ5011 (K21-5115) |
| 5 |
21-5230 |
Transformer, 230V (K21-5230) |
| 5 |
K21-5460 |
Transformer, 460V — MGJ5043 and MGJ5038 |
| 6 |
24-24-1 |
Relay, 24VAC DPDT (K24-24-1) |
| 7 |
K29-10338 |
Capacitor, 7 MFD |
| 8 |
29-2 |
Resistor, 20 Ohm (K29-2) |
| 9 |
42-10040 |
Terminal Block Assembly, 3 lug (K42-10040) |
| 10 |
42-110 |
Terminal Block, 10 position (K42-110) |
Limit Shaft & Switch
| Ref |
Part # |
Description |
| L1 |
11-11373 |
Limit Shaft |
| — |
K72-12565 |
Limit Shaft Kit — complete assembly |
| — |
K75-12566 |
Limit Switch Kit (no longer available) |
Options & Safety
| Part # |
Description |
| CPICARD |
CPI interface box |
| CPS-U |
Commercial photo eye |
| CPSUN4G |
Monitored through-beam photo eyes |
| CPS |
Safety eye sensors — mechanical operators |
| CPS-UN4 |
Safety eye sensors — commercial doors |
| K77-16011 |
Mounting hardware, CPS N4 |
| 65-5302 |
Pneumatic sensing edge, 22 ft, with take-up reel |
| LC-36A |
Safety eye sensors (no longer available) |
Other Electrical Box Versions
Contactor Style · Logic Control Version 2 · LGJ Operators · MT, BMT, MJ, MH, HMJ
