1 ou - acti
- 1 out of 2 system
- 1, master element
- 10, unit sequence switch
- 11, multifunction device
- 12, overspeed device
- 13, synchronous-speed device
- 14, underspeed device
- 15, speed or frequency matching device
- 16, not used
- 17, shunting or discharge switch
- 18, accelerating or decelerating device
- 19, starting-to-running transition contactor
- 2 out of 3 link
- 2 out of 3 selection circuit
- 2 out of 3 system
- 2 out of 4 system
- 2, time-delay starting or closing relay
- 20, electrically operated valve
- 21, distance relay
- 22, equalizer circuit breaker
- 23, temperature control device
- 24, volts per hertz relay
- 25, synchronizing or synchronism-check relay
- 26, apparatus thermal device
- 27, under voltage relay
- 28, flame detector
- 29, isolating contactor or switch
- 3 hinged arch
- 3, checking or interlocking relay
- 30, annunciator relay
- 31, separate excitation device
- 32, directional power relay
- 33, position switch
- 34, mater sequence device
- 35, brush-operating or slip-ring short-circuiting device
- 36, polarity or polarizing voltage device
- 37, undercurrent or underpower relay
- 38, bearing protective device
- 39, mechanical condition monitor
- 3D coordinate measurement
