GOST R 50030.5.1-1999 Low-voltage switchgear and controlgear. Part 5.1. Control circuit devices and switching elements. Electromechanical control circuit devices
2005GOST R 50030.5.1-2005 Low-voltage switchgear and controlgear. Part 5. Control circuit devices and switching elements. Section 1. Electromechanical control circuit devices
1999GOST R 50030.5.1-1999 Low-voltage switchgear and controlgear. Part 5.1. Control circuit devices and switching elements. Electromechanical control circuit devices