LiftMaster Electrical Box Parts — L3 for T, GT and GH Operators
Genuine replacement parts for the Logic Control Version 3 electrical box fitted to LiftMaster T trolley, GT gear-reduced trolley and GH gear-reduced hoist operators.
The transformer and the relays depend on your supply. Single-phase and three-phase machines take different C relays — ref 6 below — and the limit shaft kit differs too. Check the data label before ordering. Parts marked no longer available have been discontinued and are listed for identification only.
Single Phase or Three Phase?
Box Components
| Ref |
Part # |
Description |
| 3 |
K75-32268 |
Cover (no longer available) |
| 4 |
21-14182 |
Transformer, 115/230V (K21-14182) |
| 4 |
K21-35057 |
Transformer, 460V |
| 4 |
21-35077 |
Transformer, 575V (K21-35077) |
| 5 |
29-31244 |
Relay, 24VDC DPST — A and B relay, all operators (K29-31244) |
| 6 |
29-31229 |
Relay, 24VDC SPDT — C relay, single phase only (K29-31229) |
| 6 |
29-31245 |
Relay, 12VDC SPDT — C and D relay, three phase only (K29-31245) |
| 7 |
K74-31243 |
MOV, 580V — surge protection |
| 8 |
K79-15016-1 |
RPM Sensor Assembly |
| 12 |
42-31247 |
Terminal Block (K42-31247) |
| 13 |
42-10040 |
Terminal Block, radio (K42-10040) |
Logic Boards & Radio
| Ref |
Part # |
Description |
| 9 |
K001A5729 |
Logic Board, L3 (no longer available) |
| — |
K001A6424 |
Circuit Board Service Kit, 315MHz, 2010 onward — the current board |
| — |
K001A6424-2 |
Logic Board, medium duty E, 315MHz (no longer available) |
| — |
K001A6424-3 |
Logic Board, medium duty E, 390MHz (no longer available) |
| 10 |
K2A761 |
Coaxial Cable (K002A0761) |
| 11 |
K1C3196-3 |
Antenna (109186) |
Limit Shaft & Switch Kits — K Groups
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
L3 for J, H, HJ · Logic Control Version 2 · Contactor Style · GH 5HP Operators
