Wire & Tape Wound Power Resistors

Vitreous Enameled Wire Wound | Open Wire Wound | Vitreous Enameled Tape Wound  | Open Tape Wound | Resistor Enclosures

Vitreous Enameled Wire Wound – Type PE

Resistors are available in a range from 20 Watts to 500 Watts. The Nickel-Chrome winding is completely protected by several coats of vitreous enamel, which have been fired to produce a high reliability resistor, capable of withstanding adverse conditions. Resistors are supplied with terminal tags suitable for screws, or on some sizes, for 'Faston' terminals. Terminal bands are spot welded in position on the heat resistant ceramic former, and the winding in turn spot welded to the terminal before the enameling process. The terminal bands are therefore an integral part of the resistor, protected by the vitreous coating.

 Standard Ohmic Values 30 to 130 Watts

 Standard Ohmic Values 150 to 380 Watts

Dimensional Charts - Vitreous Enameled Wire Wound Resistors

PE Type resistors mounting and connection configurations:

• PE Type - Unmounted Vitreous Enameled Resistors with two standard connection tabs.
• PE Type Tapped- Unmounted Vitreous Enameled Resistors with multiple connection tabs.
• PE-Adj Type – An adjustable tapping clip included. Moving this clip along an exposed track on the side of the resistor provides a range of resistances.
• TB Style - Tabs for mounting resistors direct on to a panel of 6mm or less in thickness and consists of cupped washers in each end of the resistor with a tie-rod protruding.
• PE Style -WF - Live Ferrule ends allow for a flexible wire leads to connect to ferrule ends, making this style of resistor suitable for mounting directly into special mounting clips.
• PE Style -F - Dead Ferrule ends allow for the resistor to be connected to standard terminal and attaching the ferrules to standard mounting clips.
• TB Mounting Style - This configuration is suitable for mounting resistors directly to a panel of 6mm or less in thickness. It consists of cupped washers in each end of the resistor with a tie-rod protruding from each end.
• H Mounting Style - L- brackets are used for horizontal mounting, and connection tabs provide the electrical contact. The mounting brackets are attached by tie-rods and fixing nuts to ensure that the resistor will not rotate about its axis.
• HR Mounting Style - Similar to “H” above except the horizontal feet are reversed. This is ideal for applications where space is at a premium.
• V Mounting Style - This provides vertical mounting by means of a fixed bracket at one end which is appropriate for panel mounting.

Open Wire Wound – PB Type

Open Wire Wound Resistors are close wound with oxidized resistance wire. Each resistor is fitted with an adjustable tapping clip as standard.

 Standard Ohmic Values 30 to 90 Watts

 Standard Ohmic Values 130 to 380 Watts

The following mounting configurations are available for PB style resistors:

• TB Mounting Style - This configuration is suitable for mounting resistors directly to a panel of 6mm or less in thickness. It consists of cupped washers in each end of the resistor with a tie-rod protruding from each end.
• H Mounting Style - L- brackets are used for horizontal mounting, and connection tabs provide the electrical contact. The mounting brackets are attached by tie-rods and fixing nuts to ensure that the resistor will not rotate about its axis.
• HR Mounting Style - Similar to “H” above except the horizontal feet are reversed. This is ideal for applications where space is at a premium.
• V Mounting Style - This provides vertical mounting by means of a fixed bracket at one end which is appropriate for panel mounting.

Heavy Duty Vitreous Enameled Tape Wound Resistors – PT Type

Continuous Power Ratings are available from 250 Watts to 1000 Watt. For pulse ratings, refer to the "Continuous & Intermittent" and "Continuous & Short Term" Power Rating tables below. The resistor winding is completely protected by several coats of vitreous enamel, which have been fired to produce a high reliability resistor, capable of withstanding adverse conditions. Resistors are edge-wound with corrugated tape for low Ohmic Values. Corrugated tape wound resistors provide a power rating which can be approximately 25% greater than that of the equivalent wire-wound resistor, due to the increased surface area for heat dissipation. Tape-wound resistors can also be provided with an adjustable tapping clip. Thermal Cut-outs can be fitted to certain resistors to operate a contact to disconnect the resistor from the circuit preventing overload damage. The minimum and maximum resistance values given below are available within a range of standard resistance alloy. Resistors can be supplied in a Heavy-Duty Enclosure upon request.

The following mounting configurations are available for PT style resistors:

• H Mounting Style - L- brackets are used for horizontal mounting, and connection tabs provide the electrical contact. The mounting brackets are attached by tie-rods and fixing nuts to ensure that the resistor will not rotate about its axis.
• HR Mounting Style - Similar to “H” above except the horizontal feet are reversed. This is ideal for applications where space is at a premium.

Heavy Duty Open Tape Wound Resistors – PHD Type

Continuous Power Ratings are available from 200 Watts to 7500 Watts. For pulse ratings, refer to the "Continuous & Intermittent" and "Continuous & Short Term" Power Rating tables below. On this type of resistor, the power rating can be greater than that of the equivalent wire-wound resistor, due to the increased heat dissipation provided by the tape. Tape-wound resistors can also be provided with an adjustable tapping clip. Thermal Cut-outs can be fitted to certain resistors to operate a contact to disconnect the resistor from the circuit preventing overload damage. The minimum and maximum resistance values are given below are available within a range of standard resistance alloys. Resistors can be supplied in a Heavy-Duty Enclosure upon request.

The following mounting configurations are available for PHD style resistors:

• H Mounting Style - L- brackets are used for horizontal mounting, and connection tabs provide the electrical contact. The mounting brackets are attached by tie-rods and fixing nuts to ensure that the resistor will not rotate about its axis.
• HR Mounting Style - Similar to “H” above except the horizontal feet are reversed. This is ideal for applications where space is at a premium.

Other Mounting Options:

• Clips for Ferrule Ended Resistors - These clips are manufactured from Stainless Steel and are suitable for live or dead ferrule ended resistors.
• Push-In Mounting Brackets- Spring fit nickel plated phosphor bronze brackets for the ends of the tubular resistor provide an inexpensive method of mounting. They are available for PE 30, PE 40, PE 60L and PE 90L, but should not be used where rotation of the resistor in the clip is undesirable.

Resistor Enclosures

Standard Units are listed below, refer to prefixes BX40, BX75, BX275 & BX375. These have IP20 Ingress Protection, and are made with zinc plated steel with a powder coated finish. They are suitable for wall or base mounting.