- 1 – Master Element
- 12 – Overspeed Device
- 14 – Underspeed Device
- 27 – Undervoltage Relay
- 28 – Flame detector
- 30 – Annunciator Relay
- 32 – Directional Power Relay or Reverse Power Relay
- 41 – Field Circuit Breaker
- 50 – Instantaneous Overcurrent Relay
- 51 – AC Inverse Time Overcurrent Relay
- 52 – AC Circuit Breaker
| - 59 – Overvoltage Relay
- 67 – AC Directional Overcurrent Relay
- 68 – Blocking Relay
- 72 – DC Circuit Breaker
- 76 – DC Overcurrent Relay
- 78 – Phase-Angle Measuring Relay or "Out-of-Step" Relay
- 79 – AC Reclosing Relay
- 81 – Frequency Relay
- 82 – DC Reclosing Relay
- 86 – Lockout Relay
- 87 – Differential Protective Relay
- 94 – Tripping or Trip-Free Relay
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