| RET670 B40A, Ver. 2.1 | Article: RET670 B40A, Ver. 2.1 Transformer protection, Multi breaker, 3 winding differential | |
| RET670 F00, Ver. 2.1 | Article: RET670 F00, Ver. 2.1 Transformer protection | |
| RET670 N00, Ver. 2.1 | Article: RET670 N00, Ver. 2.1 Transformer protection, 61850-9-2 LE | |
| RET670 A25, Ver. 2.1 | Article: RET670 A25, Ver. 2.1 Transformer protection, Voltage and tap changer control | |
| RET670 A30, Ver. 2.1 | Article: RET670 A30, Ver. 2.1 Transformer protection, Single breaker, 2 winding differential | |
| RET670 A10, Ver. 2.1 | Article: RET670 A10, Ver. 2.1 Transformer protection, Back-up | |
| RET670 A40, Ver. 2.1 | Article: RET670 A40, Ver. 2.1 Transformer protection, Single breaker, 3 winding differential | |
| RET670 B30, Ver. 2.1 | Article: RET670 B30, Ver. 2.1 Transformer protection, Multi breaker, 2 winding differential | |
| RET670 B40, Ver. 2.1 | Article: RET670 B40, Ver. 2.1 Transformer protection, Multi breaker, 3 winding differential | |
