Our Products

MANUFACTURERS, DESIGNERS & EXPORTERS OF

• POWER RESISTORS
• High Resistivity Power Resistors
• Low Resistance Power Resistors
• Temperature Coefficient Power Resistors
Corrosion Resistance Power Resistors

• ENCLOSURES :

• Degree of Protection is IP -33 Unless otherwise specified however any degree of protection IP - 00 to IP - 55 can be offered. Tested designs are IP - 55, IP - 33 and IP - 43.

• Canopy is sloped to prevent accumulation of water. Overhang is provided on request to cover terminal box.

• Forged Eye Bolts or Lifting Angles ensure easy handling.

• Gl Wire Mesh below canopy is provided for ventilation purpose. This feature does not exist for IP - 55 enclosures.

• Basic construction of enclosure is an angle iron welded structure which provides rigidity.

• Removable bolted side covers of 2 mm thick mild steel are louvered for ventilation. GI wire mesh is welded from inside to assure required degree of protection. No louvers are given for IP 55 enclosures.

• Hinged doors are provided whenever any instruments like relays or meters are to be flush mounted.

• PAINTING

Then enclosures are painted with synthetic enamel paint of specified shade. Other options are epoxy paint or aluminimum paint.

Pretreatment, which includes, degreasing rust / scale removing, phosphating as per applicable standards, is done followed by 2 coats of finishing paint of required shade. Ovendrying or stoving is done on request.

• INTERNAL FEATURES OF RESISTOR ENCLOSURES :

• Resistance banks are bolted on angles welded to the angle iron structure, facilitating easy drawout facility when required.

• Insulation between resistance element and supporting tie rod is provided by a mica sleeve.

• The tie rod is insulated from the supporting structure by 3 Groove Insulators.

• A sloped bottom sheet is welded to the angle iron structure and drain plug is provided at suitable place.

• In case of continuous current ratings for better heat dissipation, perforated sheet with welded GI wire mesh is provided at the bottom.

• Foundation channels welded to the angle iron structure are provided on two sides with arrangement to fix on foundation by bolts.

• Indoor enclosures, do not have sloping or overhang features of the canopy. The bottom welded sheet is also not sloped.

• Gland plate for bottom cable entry in terminal box is provided if applicable. In case of busduct connections, a flange of specified dimensions is provided for connection to transformer.

• Terminals are brought through porcelain bushings of appropriate voltage class.

• In case of higher voltage the banks are placed on stand off insulators housed inside the enclosures.

Optional features : (Provided on request)

• Safety Screen for enclosures
• Stand off insulators
• Supporting structures
• Aluminium covers instead of MS.
• Hot dip galvanised enclosure
• Stainless steel hardware

• DESIGN OF RESISTOR ELEMENT :

Resistor elements are designed to carry rated current for the rated time without exceeding specified temperature limits. In case of short time ratings, dissipation is negligible and the temperature rise for the resistor element depends on its capacity to store the energy generated in proportion to the mass and specific heat of the material used.

When the current flows continuously for a relatively long duration, the temperature of resistor element increases and then stabilizes at value for which energy supplied is entirely dissipated to the atmospheres. Hence such resistors are designed to allow for maximum heat dissipation.

AMPCONTROL has the backing of over 25 years of experience that its promoters have gained in design and manufacture of RESISTORS. A comprehensive quality assurance plan and adherence to international specifications ensures a durable competitively priced product which meets the customer requirements.

Our growing list of customers in India and abroad include :

• SELECTION OF RESISTOR MATERIAL

DESIRABLE QUALITIES OF RESISTOR MATERIAL ARE :

• HIGH RESISTIVITY

• LOW RESISTANCE TEMPERATURE COEFFICIENT

• CORROSION RESISTANCE

• DATA TO ACCOMPANY THE ENQUIRY

The following data is required to be sent along with the enquiry :

• Material of resistor
• Time Rating
• Current Rating
• Sheet Thickness
• Outdoor / Indoor Sheet
• Rotor Voltage
• Slip
• No. of steps

• Temperature rise
• Voltage Class
• Ohmic Value
• Protection Class of enclosure
• For starting resistors
• Rotor Amps
• Starting & Full Load Torque
• Type of Coating (Synthetic Enamel Paint / Epoxy paint / Hot dip Galvanised)

• OPTIONAL FEATURES

• Space Heater with Thermostat
• Aluminium Covers instead of MS
• Supporting Structure Safety Screen
• Earth Fault Relay
• Cable Sealing kit
• Glands
• Non Magnetic Gland Plate
• Stand off Insulator

• Earth Fault Current Transformer
• AAmmeter
• Off Load Isolator / On Load Isolator
• Lugs
• Indicating Lamps