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What is a 3 phase 20 amp RCBO made up of?

The part number for a 3 phase, 20Amp RCBO is a 4RCBE420/30.

Specifications

Supply Voltage	415 V AC
Rating	20A
Fault Current	6000A
Sensitivity	30mA
Poles	3P+N
Type	Type A
Pole Width	5 Modules (18mm × 5)
Curve Type	C - Curve
Top or Bottom Fed	Both
IP Rating	IP20
Mount	Din-Rail (Double Locking Clip)
Indicator	Positive Contact and Red Flag
Certification	Approval to AS/ NZS 61009.1:2015