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R621       *Protect circuits with appropriate circuit breakers. Each branch circuit must be protected by 1 and only 1 circuit breaker or fuse on the PD per Table 8‑3. No other electrical load can be connected to the breaker or fuse supplying this circuit with the exception of devices downstream of a permitted motor power adapter board placed between the PD and a motor controller (WCP-1380, WCP-1903, WCP-1904, RF-4003, RF-4004, RF-4005).

Table 8‑3 Branch circuit protection requirements

Branch Circuit

Circuit Breaker/ Fuse Value

Quantity Allowed Per Breaker

Motor Controller

Up to 40A

1

CUSTOM CIRCUIT

Up to 40A

No limit

Automation Direct Relay 40A (*6M40*)

Up to 40A

1

Fans permitted per R501 and not already part of COTS computing devices.

Up to 20A

No limit

Spike Relay Module

Up to 20A

1

Automation Direct Relay 25A (*6M25*)

Up to 20A

1

PCM/PH – with compressor

Up to 20A

1

Servo Power Module/Servo Hub

Up to 20A

1

Additional VRM (non-radio)/Additional PCM/PH (non-compressor)

Up to 20A

3 total

Automation Direct Relay 12A (*6M12*)

Up to 10A

1

This rule does not prohibit the use of smaller value breakers in the PD or any fuses or breakers within CUSTOM CIRCUITS for additional protection.

Fans permitted per R501 may also be included within CUSTOM CIRCUITS.

Similar Rules

Rule R619
R619       *Only use specified circuit breakers in a PD. The only circuit breakers permitted for use in the PD are:
Rule R620
R620       *Only use specified fuses in PD. The only fuses permitted for use in the PD are automotive blade fuses with the following values:
Rule R505
R505       *Don’t overload controllers. Each power regulating device may control electrical loads per Table 8‑2. Unless otherwise noted, each power regulating device shall control 1 and only 1 electrical load.
Rule R622
R622       *Use appropriately sized wire. All circuits shall be wired with appropriately sized insulated copper wire (SIGNAL LEVEL cables don’t have to be copper):