3.2.2.3 Relay symbols
General relays symbol names shall be RL A B C D E F where:
- A = Generic name (see below) or manufacturer e.g. TYCO
- B = Generic build (see below) or family e.g. IM, HF
- C = optional configuration for variations
- D = optional additional information such as TH or SM for variations
- E = D optional diode
- F = optional SPLIT if a split relay model
Generic name
- 1A = SPST (NO)
- 1B = SPST (NC)
- 2A = DPST (NO)
- 2B = DPST (NC)
- 1A1B = DPST (NO & NC)
- 1C = SPDT
- 2C = DPDT
Generic build DPDT abcdefgh<space>i(j etc)
- a = +coil pin number
- b = -coil pin number
- c = NO 1 pin number
- d = COM 1 pin number
- e = NC 1 pin number
- f = NO 2 pin number
- g = COM 2 pin number
- h = NC 2 pin number
- i = GND or Screen pin number(s)