BCH Electric Ltd.

Brand	BCH
Condition	New
Cat Code	WL 10
Type of Terminal	S
Continuous Current Rating	225
Resistance Per Bank	0.1 Ohms
Resistance Per Top	0.020 Ohms
Number of Taps	5

BCH un-breakable Punched Grid Resistors features an all welded current path for heavy duty applications. The units have been made robust, versatile and yet economical for use as starting or speed control resistors for complete range of AC and DC motors.
The resistor unit can meet the need of any industrial applications like :

• Neutral grounding
• AC / DC Cranes
• Steel Mills
• Slipring Motor starting

Resistor Bank Assembly (draw-out)
Multiple resistance bank mounting frame is a sheet steel frame, sturdy in construction with welded top and bottom plates having corrosion resistant finish. They are available in different sizes to accommodate from 3 to 6 resistor banks and can be used with the WL bank. These mounting frames can be installed back to back and side by side and have provision for bolting to floor. Resistor bank can be stacked within the mounting frame and can be drawn out from the front quite easily, without disturbing the end plates.

Enclosure
Sheet steel enclosures of IP-11 and IP-33 as per IS-2147 are available for stacked assemblies with adequate ventilation. IP-11 type enclosures are also available for back to back arrangement.

Dimensions
Dimensions of the enclosures are as given below. Figure 1 gives the overall dimensional drawing for Punched grid resistor panel WL with integral terminal arrangement enclosure type IP 33 for single column & double column.

Current ratings
Table I give continuous current rating, type of terminals, resistance per bank & resistance per tap, and total number of taps, based on NEMA requirements Table II & III gives the intermittent duty rating of WL type grids.

Parts of Punch Grid Resistors
Grid element: Individual grids are stamped out of aluminium chromium steel alloy. The grids are in 3 patterns, i.e 5, 9 or no slots with different thickness of materials.

Terminals: 2 types of terminals are available depending on current rating.

Welded joints: All joint are T.I.G welded to provide a continuous current path ensuring low loss.

Dual Terminal: The dual terminal taps for lower rating have 2 projections for connectors.

Square Terminal: The square terminal taps for higher rating are flat and when provided with cast terminal clamps are suitable for a maximum of two 95 mm sq. solid wires.

Floating Rod design: Floating rod design in end plate is an exclusive feature which permits 'draw out' removal of grid assembly from frame. Allows for expansion and contraction of individual grids.

Features:

• Un-breakable Chromium Steel alloy grids in Superior FeCrAL grade AISI406. Corrosion and vibration resistan.
• The low temperature coefficient of (0.00022 ohms/ohm/°c) resistance results in negligible change in resistance from cold to hot.
• The alloy has a high specific resistance - about 120 micro ohms cm. This results in 50% saving of the material by weight for the same value of resistance.
• Grid junction are TIG welded - continuous current path unaffected by vibrations.
• High capacity (upto 225A per bank) without paralleling.
• Steel and mica spacers.
• Terminals designed for 2 conductors.
• Compact and light in weight for equivalent current capacity of other type of grids.
• Sufficient number of tappings to simplify the adjustment of resistance.
• Resistance range from 0.1 Ohms minimum to 16 Ohms maximum per bank.
• Multiple resistors in mounting frame for open execution.
• Resistors in enclosure with protection category IP 33 or IP 11 or higher.
• Exclusive draw-out type enclosure.