HOMA Bar mounted contactors: AC contactors

HOMA has been developing and manufacturing AC and DC bar contactors for railway technology, foundries and steel works, solar and wind turbines, starters, battery test equipment, ripple control systems, rolling and crane systems for more than 60 years.

HOMA is a system supplier to well-known manufacturers. In addition to the production of switching devices, HOMA is able to solve complex tasks for customers and to develop, manufacture and install complete control cabinets including power electronics.

The AC contactors are part of the extensive range of switching devices of all kinds. Also in the range: Special accessories to expand the function of large contactors in the context of overcurrent shutdown.

HOMA AC Bar mounted Contactors

AC Switches

HOMA AC switches are often used in applications where high currents under difficult switching circumstances have to be switched. Difficult circumstances are given i.e. in cases of low pure cosinus phi. These applications can be found in motors, inductive loads and capacitive loads. HOMA switches are worldwide known for switching of high currents.

HOMA switches can switch currents of up to 50.000A.

HOMA AC Switches: Product Range

Power contactors (on Load)

DC-contactors up to a maximum of 12.000A / 3.000V
Medium-frequency contactors up to a maximum of 12000A / 3.000V < 10 kHz
Medium-frequency contactors up to a maximum of 24000A / 3.000V
Capacitor contactors up to a maximum of 1.000A / 3.000V < 10kHz

High current switches (off Load)

Cut-off and changeover switches up to a maximum of 50.000A / 3.000V / 0-150kHz
Air- and water-cooled commutators and pole-reversal contactor up to a maximum of 25.000A
Command units to control recurring switching operations
Contact installations for galvanic-technology in the form of air- and water-cooled prism or sliding contacts up to a maximum of 20.000A

HOMA Bar mounted Contactors

In HOMA Bar mounted Contactors current-carrying components are organized on the basis of a main frame construction. All required modules are arranged on top of a single frame (bar), for example: Magnet system, Terminal plate for power circuit, Switch locking system and Movable contacts. The two examples below (G500 / HAT-2W) illustrate the construction.

TYP G500

1

magnet system

2

coil

3

AUXILIARY CONTACTS

4

U-profile

5

control unit

6

terminal plate

7

grounding

8

main frame

9

nc-current pole

10

no main poles

Bar mounted contactors by HOMA - TYP G500

TYP HAT-2W

1

SWITCH LOCK. SYSTEM

2

magnet system

3

coil

4

AUXILIARY CONTACTS

5

U-PROFILe

6

stationary contact

7

connection

8

main frame

9

movable contacts

10

inter locking device

Bar mounted contactors by HOMA - Typ HAT-2W

HOMA Switchgear

For over 60 years

HOMA switches are being built into different applications for more than 60 years and have been supplied to more than 100 countries. Due to the worldwide experience of HOMA, many national and international norms can be fullfield and have conducted a vast number of type tests for our products. We equip our switches with coils that can be operated worldwide with 60V to 480V AC/DC. The worldwide distribution network ensures minimal downtimes in case of a break down. HOMA is known for short delivery times and due to its modular design, switches can be assembled and delivered within 24 hours.

Switching

Air-break contactors and combinations of switches to deal with normal to complicated switching activities for all types of electrical loads.

Isolation

Sliding contacts, air-break contactors and air- or water-cooled high current switches for galvanic interruption of circuits without a control current for technical or safety reasons.

Distributing

Different types of commutators to select different sources or for an alternative supply of the electrical load circuit.

Controlling

Commutators and pole-reversal contactor including associated control systems, reversing contactors etc. for process-related reversion of the electrical current or rotational direction; braking contactors for switchoff for drives that simultaneously trigger dynamic braking systems.

Regulating

Starting contactor / rotor-short circuit contactor, as well as starting coupling contactor / cascade coupling contactor for large machinery in association with subsynchronous static converter systems cascade; capacitor contactors for balancing or compensating inductive electrical loads. Starting, damping and discharge resistors.

Products

G800-Rail Negative Earthing and Shorting Switch

Rated voltage (U_n)

0,1 - 3,0 kV

Rated current (I_n)

0,3 - 2,0 kA

Peak current (200 ms)

25 kA

Isolation voltage (U_i)

1 - 3 kV

Breaking capacity

12 kA

Making capacity

25 kA

Number of poles (N/C)

1

Operation

Magnet system

Switching time

12 - 60 ms closing / 20 - 100 ms opening

Control voltageCtrl. volt. (U_c)

60, 110, 230, 400 V, DC/50/60 Hz

Type tested

yes

Switching cycles

> 1.000.000

G1400-Rail Negative Earthing and Shorting Switch

Rated voltage (U_n)

0,1 - 3,0 kV

Rated current (I_n)

0,3 - 2,0 kA

Peak current (200 ms)

50 kA

Isolation voltage (U_i)

1 - 3 kV

Breaking capacity

16 kA

Making capacity

50 kA

Number of poles (N/C)

1

Operation

Magnet system

Schaltzeit

12 - 60 ms closing / 20 - 100 ms opening

Switching timeSwitch. time (U_c)

60, 110, 230, 400 V, DC/50/60 Hz

Type tested

yes

Switching cycles

> 1.000.000

G800 On Load Contactor

Rated voltage (>U_n)

0,1 - 3,0 kV

Rated current (I_n)

0,3 - 5,0 kA

Peak current (200 ms)

25 kA

Isolation voltage (U_i)

1 - 3 kV

Breaking capacity

12 kA

Making capacity

25 kA

Number of poles (N/O)

2

Operation

Magnetsystem

Switching time

12 - 60 ms closing / 20 - 100 ms opening

Control voltageCtrl. volt. (U_c)

60, 110, 230, 400 V, DC/50/60 Hz

Type tested

yes

Switching cycles

> 3.000.000

NFG 500V O.L. Negative Earthing Switch

Rated voltage (U_n)

0,1 - 3,0 kV

Rated current (I_n)

0,3 - 2,5 kA

Peak current (200 ms)

25 kA

Isolation voltage (U_i)

1 - 3 kV

Breaking capacity

-

Making capacity

25 kA

Number of poles (N/C)

1

Operation

Magnet system

Switching time

12 - 60 ms closing / 20 - 100 ms opening

Control voltageCtrl. volt. (U_c)

60, 110, 230, 400 V, DC/50/60 Hz

Type tested

yes

Switching cycles

> 1.000.000

KMT Disconnector

Rated voltage (U_n)

0,1 - 3,6 kV

Rated current (I_n)

2,0 - 4,5 kA

Peak current (200 ms)

25 kA

Isolation voltage (U_i)

1 - 3,6 kV

Breaking capacity

-

Making capacity

-

Number of poles (N/O)

2

Operation

motorized

Switching time

3 s closing / 3 s opening

Control voltageCtrl. volt. (U_c)

230 V, 50/60 Hz

Type tested

yes

Switching cycles

> 1.000.000

HOMA Over-current sensor

For expanding the function of large Contactors for over-current Deactivation

The device enables the monitoring of up to three phase currents. If one of the thresholds set via the jumper is exceeded, the coil current (field current) of the large contactor is interrupted and, thus, deactivated, in the event of over-current. Only one common threshold can be set for the three sensors. Both AC and DC currents can be monitored. In the case of DC currents, the triggering does not depend on the current direction. The system can also be utilised to monitor alternating current systems. The three sensors can then be assigned to each phase.

The sensors themselves must be connected directly to the busbars. They can be connected via screws or cable ties (black). The current measuring functions by measuring the field strength H that surrounds every live conductor. Due to the fact that the field strength depends on the distance of the measuring point from the conductor, the sensors must be installed in accordance with the instructions.

The sensors are delivered with a 1 m long connection cable as standard and connected to the control unit belonging to the system. Neither connection work nor adjustments need to be carried out on the sensors.