Power Supply

Internal and External Power Supplies

The MicroLogic Active control unit is powered by the current through the internal current transformers (CT).

• The standard protection functions of MicroLogic Active control units operate with the internal current supply.

• If the load current is higher than 20% of the rated current In, the internal current supply provides the power supply for the full functioning of the MicroLogic Active control unit. This includes:

  • The MicroLogic Active display screen and LEDs

  • The metering functions

  • The maintenance and diagnostic functions

  • The IEEE 802.15.4 wireless communication

To provide a power supply to the MicroLogic Active control unit when the load is below 20% of the rated current In, and maintain the full functioning of the MicroLogic Active control unit, optional external power supplies can be used. External power supplies include the following:

• Permanent power supplies: external 24 Vdc power supply.

• Temporary power supplies connected to the USB-C port of the MicroLogic Active control unit:

  • External Mobile Power Pack through USB connection.

  • Android smartphone through USB OTG connection.

  • PC through USB connection.

Each external MicroLogic Active power supply is described further.

External 24 Vdc Power Supply

The 24 Vdc power supply maintains the operation of all functions of the MicroLogic Active control unit in all circumstances, even when the circuit breaker is open and not energized.

DANGER

hazard of electrocution Supply MicroLogic Active control units with 24 Vdc non-SELV (Safety Extra Low Voltage) power supply only, paying attention to polarity. Do not supply double-insulated SELV devices with the 24 Vdc non-SELV power supply of the MicroLogic Active control unit. For example, do not use the non-SELV 24 Vdc power supply of a MicroLogic Active control unit to supply a MicroLogic X control unit or an SELV communication module. Failure to follow these instructions will result in death or serious injury.

The MasterPacT MTZ circuit breaker with MicroLogic Active control unit provides double insulation for the USB-C port, up to 8 kVdc and 690 Vac. Double or reinforced insulation is one of the protective measures against electric shock which conforms to IEC and CENELEC HD 60364-4-41 (Low voltage installations - Protection against electric shock).

Recommendations for the use of external 24 Vdc power supplies:

• The same 24 Vdc power supply can be used to supply several MicroLogic Active control units, depending on the overall power requirements of the system.

• Use a separate 24 Vdc power supply to supply the MN/MX/XF voltage releases or the MCH gear motor.

Recommended 24 Vdc Power Supplies

Available 24 Vdc power supplies include the range of Phaseo ABL8 power supplies and the AD power supplies. For more information, refer to the MasterPacT MTZ Catalog.

Characteristic	Phaseo ABL8 power supply	AD power supply
Illustration
Overvoltage category defined by IEC 60947-1	Category II	Category IV per IEC 62477-1 (Vac model) Category III per IEC 62477-1 (Vdc model)
Input supply voltage AC	110–120 Vac 200–500 Vac	110–130 Vac 200–240 Vac
Input supply voltage DC	–	24–30 Vdc 48–60 Vdc 100–125 Vdc
Dielectric withstand	Input/output: 4 kV RMS for 1 minute Input/ground: 3 kV RMS for 1 minute Output/ground: 0.5 kV RMS for 1 minute	Input/output: 3 kV RMS for 1 minute (110–130 Vac and 200–240 Vac model) 3 kV RMS for 1 minute (110–125 Vdc model) 2 kV RMS for 1 minute (24–30 Vdc and 48–60 Vdc model)
Temperature	50 °C (122 °F) 60 °C (140 °F) with 80% nominal load maximum	70 °C (158 °F)
Output current	3 A, 5 A, or 10 A	1 A
Ripple	200 mV peak-peak	200 mV peak-peak
Output voltage setting for line loss compensation	24–28.8 Vdc	22.8–25.2 Vdc

NOTE: For applications requiring an overvoltage category higher than II, install a surge arrester when using a 24 Vdc ABL8 power supply.

Mobile Power Pack

The Mobile Power Pack is an external battery that enables power to be supplied temporarily to the MicroLogic Active control unit.

The Mobile Power Pack enables use of the MicroLogic Active display screen and keypad for setting and displaying when the power supply to the MicroLogic Active control unit is interrupted.

The external Mobile Power Pack can be connected by using a USB cable (RS PRO, reference 182-8848) connected to the USB-C port on the MicroLogic Active control unit.

Check the charge level of the Mobile Power Pack by pressing the test button for one second. The indicator on the Mobile Power Pack lights up to indicate the remaining charge.

Internal Battery

When no other power supply is supplying the MicroLogic Active control unit, the internal battery powers the:

• Trip cause LEDs

• Status bar

• Internal clock (date and time)

• Maintenance schedule function

The internal battery is protected by a strip. Remember to remove the battery strip before operation. For information about the removal of the battery strip, consult the instruction sheets for MasterPacT MTZ circuit breakers in Related Documents.