Star Delta Motor Starter MaU

Magnum Semi-Automatic Star Delta Starters are controlling devices for your submersible Pumps/Motors. These are made from quality raw materials, enabling it to protect and control your motor consistently.
1. Switches your pump/motor on and off.
2. Being based on Star-Delta mechanism the starting torque & current is considerably reduced on the motor.
3. Protects the pump/motor from over-current.
4. Protects the pump/motor from Single phasing condition
5. Under voltage protection & trips when persistent overload on the motor.
6. Ensures reliable performance in high ambient temperatures, humidity & under-voltage conditions.

Salient Features

1. Powder coated MS enclosure for complete corrosion resistance.
2. Rugged MaU contactors with wide voltage band (200-440V).
Magnum Switchgear, Bangalore 5
3. Fitted with MaU type relay for reliable overload protection.
4. Fitted with Toroidal type preventer (current sensing) used to protect the motor against single phasing.
5. Manual reset facility after overload protection.
6. A latch on the push button can be used to keep the stop button locked, thus preventing accidental starting.
7. Input & Output connections are terminated through a terminal block [Hence no intervention is required on the circuit]
8. All connections are terminated through appropriate crimping Luggs.
9. Easy & quick mounting.
10. Ergonomic design with aesthetic looks.
11. There is a provision for using an auxiliary contact block with configuration 1NO + 1NC.
12. No screw protrusion from the panel, hence additional safety from water, dust, corrosion and electric shock.


1. Power range : Up to 20 HP
2. Coil Voltage : 440 V
3. Operating Voltage : 70% to 110% of coil voltage
4. Pick up voltage : Minimum 60% of coil voltage
5. Drop off voltage : Below 50% of coil voltage
6. Contactor 4P : MaU [16A / 25A / 32A]
7. Relay 4P : MaU-1 / MaU-2
8. Area : MaU (370 * 330 * 143) mm
9. Net Weight : 8.6 – 8.7 Kilo grams
10. Frequency : 50Hz
11. Insulation Voltage Ac (Vi) : 660V
12. Ambient Temperature : -25°C to +55°C
13. Terminal Capacity : 1 * 16 (mm)^2 or 2 * 10 (mm)^2


Magnum MaU Star Delta Motor Starter is used for higher current carrying motors. Star Delta Starters are used generally for motors above 10 H.P