HOMA for Foundries
With more than 60 years of experience in the field of foundries, induction furnaces and melting furnaces - HOMA contactors set the standard in this field. Main uses are switching power on load as well as off load. On load switching can be used for switching furnaces on and off. Off load switching allows one transformer to be used for two furnaces. Power is constantly switched between the furnaces in a high frequency range.
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.
Air-break contactors and combinations of switches to deal with normal to complicated switching activities for all types of electrical loads.
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.
Different types of commutators to select different sources or for an alternative supply of the electrical load circuit.
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.
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.
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.
HOMA DC/AC Bar mounted Contactors
HOMA develops and manufactures AC and DC bar mounted contactors for railway applications, foundries and steel furnaces, solar and wind turbines, motor starters, battery test devices, ripple control systems, rolling mills and cranes since more than 60 years. HOMA is a system supplier for renowned manufacturers. Beside manufacturing contactors as a component, HOMA is capable to develop, manufacture and install turnkey solutions for complex requirements including supply of control cabinets and power electronics.
HOMA manufactures DC switches for a variety of DC applications. These can operate under voltages of up to 3.000V DC. The HOMA product range includes switches and switching combinations with positive and negative contacts. HOMA switches are being used for many years in applications that have to operate under high temperatures and continue to conduct and switch high voltages. By using silver contacts and therefore having low ohmic losses, HOMA switches improve the energy balance and reduce energy losses. DC switches can reach switching periods of under 16 milliseconds.
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 DC-/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
High Current Cables
95mm² to 8.000mm². Air- and watercooled.
HOMA offers engineering and fabrication of copper tube systems.
As a system supplier in the field of high current technology our product portfolio includes a variety of power connections. Beside a high flexibility, our products are known for a long life time and reliability.
Current Carrying Connections
- High current cables 95mm² up to 8.000mm² air- and water cooled
- Flexible connections/braids (Copper and Aluminium)
- Press welded shunts (Copper)
- Bus bars
- Copper tubes or bus systems
- Insulating materials
- Starting - damping - discharge resistors
- Insulator - supports up to 3000 V
- Bus bar - supports
- Vertically adjustable insulators
- High current lines (transformer house)
- Contact jaws
- Electrode arm systems