Perform a Primary Injection Test

Description

WARNING
hazard of UNPROTECTED ELECTRICAL NETWORK Perform a primary injection test to check that the MicroLogic Active control unit is able to provide basic protection functions, for example tripping the circuit breaker in case of an electrical network incident. Failure to follow these instructions can result in death, serious injury, or equipment damage.

A primary injection test is mandatory to help ensure that all trip system connections have been correctly made. The test is performed by injecting a controlled current from an external power source, into the primary circuit of the circuit breaker.

Preparing the Primary Injection Test

A wiring diagram of the primary injection test kit for MasterPacT MTZ1 and MasterPacT MTZ2 circuit breakers is illustrated below.

Use 2.5 mm² cables between R1 and CTR1.

B1	MCB circuit breaker 10 A
T1	Transformer 250 VA
B2	MCB circuit breaker 30 A
CTR1	Control relay
P.B.	Pushbutton
R1	Resistance 300 W - 2,2 Ohms
J1	Jaws for connection to the upstream and equivalent downstream of one pole

Bill of Materials

Schneider Electric recommends the following components for the primary injection test kit for MasterPacT MTZ1 and MasterPacT MTZ2 circuit breakers.

Schematic reference	Item	Supplier	Reference	Quantity
B1	Circuit breaker DT40 – 10 A + Vigi 30 mA	Schneider Electric	A9D55610	1
T1	Transformer 250VA 220 Vac – 24 Vac	BLOCK	FST 250/24	1
B2	Circuit breaker DT40 – 16 A + Vigi 30 mA	Schneider Electric	A9N21025+ A9N21454	1
CTR1	Auxiliary Zelio relay	Schneider Electric	RSB2A080B7	1
P.B	Pushbutton with normally open contact	Schneider Electric	XB4BL41	1
R1	Resistor 2,2 ohms – 300 W	WIDAP	160169	1
R1	Resistor 2,2 ohms – 300 W	Conrad	1525215	1
J1	Jaws	GRELUMA	ZL373LUM	2
–	Terminal block for multimeter connection	Schneider Electric	47075	2

NOTE: For the MasterPacT MTZ3 primary injection test kit, contact Schneider Electric Customer Care.

Performing the Primary Injection Test

Step	Action
1	Disconnect the circuit breaker from the switchboard network before starting.
2	Charge the mechanism by pulling the spring charging handle down seven times.
3	Close the circuit breaker by pressing the closing pushbutton on the front of the circuit breaker.
4	Connect the primary circuit of the circuit breaker to the kit using the jaws (J1), as shown in the wiring diagram above. Use 10 A 24 Vac for MasterPacT MTZ1 and MasterPacT MTZ2 circuit breakers. Use 30 A 24 Vac for MasterPacT MTZ3 circuit breakers. Connect the external power source to the upstream and downstream of one pole.
5	Connect the positive probe of the multimeter to M1 on the UC1 terminal block. Connect the negative probe of the multimeter to M3 on the UC2 terminal block.
6	Press the pushbutton to inject current into the circuit breaker.
7	Wait until the voltage reading is greater than 1 Vdc.
8	The test passes if the measured voltage is greater than 1 Vdc.

Example of a Primary Injection Test Kit

A	Circuit breaker block
B	Jaw connected to upstream pole
C	Primary injection test kit
D	Jaw connected to downstream pole