Siemens Sirius 3RT20 Contactors & Siemens Sirius 3RU21 Overloads.
Here is a handy cross reference to help choose the correct contactor and overload.
| Siemens old Style Contactor | Siemens New Style Contactor | Siemens Old Style Overload | Siemens New Style Overload |
| 3RT1015-1AB01 | 3RT2015-1AB01 | 3RU1116-0AB0 | 3RU2116-0AB0 |
| 3RT1015-1AB02 | 3RT2015-1AB02 | 3RU1116-0BB0 | 3RU2116-0AB0 |
| 3RT1015-1AK61 | 3RT2015-1AK61 | 3RU1116-0CB0 | 3RU2116-0CB0 |
| 3RT1015-1AK62 | 3RT2015-1AK62 | 3RU1116-0DB0 | 3RU2116-0DB0 |
| 3RT1015-1AP61 | 3RT2015-1AP61 | 3RU1116-0EB0 | 3RU2116-0EB0 |
| 3RT1015-1AP62 | 3RT2015-1AP62 | 3RU1116-0FB0 | 3RU2116-0FB0 |
| 3RT1015-1BB41 | 3RT2015-1BB41 | 3RU1116-0GB0 | 3RU2116-0GB0 |
| 3RT1015-1BB42 | 3RT2015-1BB42 | 3RU1116-0HB0 | 3RU2116-0HB0 |
| 3RU1116-0JB0 | 3RU2116-0JB0 | ||
| 3RT1016-1AB01 | 3RT2016-1AB01 | 3RU1116-0KB0 | 3RU2116-0KB0 |
| 3RT1016-1AB02 | 3RT2016-1AB02 | 3RU1116-1AB0 | 3RU2116-1AB0 |
| 3RT1016-1AK61 | 3RT2016-1AK61 | 3RU1116-1BB0 | 3RU2116-1BB0 |
| 3RT1016-1AK62 | 3RT2016-1AK62 | 3RU1116-1CB0 | 3RU2116-1CB0 |
| 3RT1016-1AP61 | 3RT2016-1AP61 | 3RU1116-1DB0 | 3RU2116-1DB0 |
| 3RT1016-1AP62 | 3RT2016-1AP62 | 3RU1116-1EB0 | 3RU2116-1EB0 |
| 3RT1016-1BB41 | 3RT2016-1BB41 | 3RU1116-1FB0 | 3RU2116-1FB0 |
| 3RT1016-1BB42 | 3RT2016-1BB42 | 3RU1116-1GB0 | 3RU2116-1GB0 |
| 3RU1116-1HB0 | 3RU2116-1HB0 | ||
| 3RT1017-1AB01 | 3RT2017-1AB01 | 3RU1116-1JB0 | 3RU2116-1JB0 |
| 3RT1017-1AB02 | 3RT2017-1AB02 | 3RU1116-1KB0 | 3RU2116-1KB0 |
| 3RT1017-1AK61 | 3RT2017-1AK61 | ||
| 3RT1017-1AK62 | 3RT2017-1AK62 | 3RU1126-1CB0 | 3RU2126-1CB0 |
| 3RT1017-1AP61 | 3RT2017-1AP61 | 3RU1126-1DB0 | 3RU2126-1DB0 |
| 3RT1017-1AP62 | 3RT2017-1AP62 | 3RU1126-1EB0 | 3RU2126-1EB0 |
| 3RT1017-1BB41 | 3RT2017-1BB41 | 3RU1126-1FB0 | 3RU2126-1FB0 |
| 3RT1017-1BB42 | 3RT2017-1BB42 | 3RU1126-1GB0 | 3RU2126-1GB0 |
| 3RU1126-1HB0 | 3RU2126-1HB0 | ||
| 3RT1023-1AC20 | 3RT2023-1AC20 | 3RU1126-1JB0 | 3RU2126-1JB0 |
| 3RT1023-1AK60 | 3RT2023-1AK60 | 3RU1126-1KB0 | 3RU2126-1KB0 |
| 3RT1023-1AP60 | 3RT2023-1AP60 | 3RU1126-4AB0 | 3RU2126-4AB0 |
| 3RT1023-1AV60 | 3RT2023-1AV60 | 3RU1126-4BB0 | 3RU2126-4BB0 |
| 3RT1023-1BB40 | 3RT2023-1BB40 | 3RU1126-4CB0 | 3RU2126-4CB0 |
| 3RU1126-4DB0 | 3RU2126-4DB0 | ||
| 3RT1024-1AC20 | 3RT2024-1AC20 | ||
| 3RT1024-1AK60 | 3RT2024-1AK60 | ||
| 3RT1024-1AP60 | 3RT2024-1AP60 | ||
| 3RT1024-1AV60 | 3RT2024-1AV60 | ||
| 3RT1024-1BB40 | 3RT2024-1BB40 | ||
| XX | |||
| 3RT1025-1AC20 | 3RT2025-1AC20 | ||
| 3RT1025-1AK60 | 3RT2025-1AK60 | ||
| 3RT1025-1AP60 | 3RT2025-1AP60 | ||
| 3RT1025-1AV60 | 3RT2025-1AV60 | ||
| 3RT1025-1BB40 | 3RT2025-1BB40 | ||
| XX | |||
| 3RT1026-1AC20 | 3RT2026-1AC20 | ||
| 3RT1026-1AK60 | 3RT2026-1AK60 | ||
| 3RT1026-1AP60 | 3RT2026-1AP60 | ||
| 3RT1026-1AV60 | 3RT2026-1AV60 | ||
| 3RT1026-1BB40 | 3RT2026-1BB40 |