Stocks An Inventory Of Chassis Mount Resistors Available In Various Sizes And Shapes

What are chassis mount resistors?

Chassis resistors are sluggish devices that are against the flow of voltage and are employed to automate signal levels, distribute voltages, bias sensing elements, or endpoint transmission lines, among other applications. These resistors are usually extended and may distribute up to 2500 watts of energy.

Why use chassis resistors?

A metallic wire is coiled around a non-conductive core in chassis resistors with a metal, often aluminum, housing to inhibit or restrict the flow of current and facilitate heat conduction. They could also be made flameproof or contain a corrugated ribbon component for quick cooling. Wire wound resistor technology is used to create chassis resistors, which have a sizable ceramic core that is molded into an extruded aluminum chassis-mount shell. The aluminum enclosure offers improved heat conduction, and the wire wound construction enhances pulse handling.

Applications of the chassis resistor

Large electrical and manufacturing machinery, motor start or stop cycles, equipment discharge, load test simulation, and dynamic brakes all often require chassis mount. Due to their low-temperature coefficient of resistance (TCR), or the fact that they maintain practically constant resistance across a wide temperature range, chassis resistors are also particularly well suited for applications where the resistor is utilized to aid heat loss and cooling.

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L25J20KE, Ohmite

RES CHAS MNT 20K OHM 5% 25W

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L100J10KE, Ohmite

RES CHAS MNT 10K OHM 5% 100W

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CBRV295CH777-6R8-KT, Danotherm

These resistors are insulated and can easily be mounted in compact constructions. They are specially constructed for high pulse loads compared to the average load. The nominal load can be improved by forced air cooling or by mounting the resistors on a heat sink. The resistor elements are wirewound on mica support sheets. Lower ohmic values are made with helix wound elements mounted in a ceramic support. The outer housing is an aluminium profile insulated with micanite sheets on all inner surfaces. The resistor elements are fixed symmetrically in the profile by the mica construction. This ensures a symmetric expansion of the resistors and a maximum stability to high load impulses. The aluminium profile with the fixed resistor element is filled with quartz sand. This ensures a minimum change of the resistor surface temperature even if the resistor element reaches its maximum temperature during a pulse load. Compact Cool surface High pulse load capability High vibration capability No live parts outside High IP class Low noise level Low thermal drift The Alpha range of resistors from Danotherm consist of fully welded wirewound resistors, mounted in silica sand, insulated with Micanite and mounted in an anodised aluminium housing. The base material is high temperature Micanite which is long time stable at +700°C and short time resistant up to +1000°C. The construction has high resistance to temperature changes. These braking resistors comply with IP50 giving electrical and thermal protection. Danotherm has developed thermal simulation corresponding to all resistor types and resistor values. By using these models, Danotherm were able to calculate the temperature rises in the resistor wire and on the surface for all possible load applications. Danotherm CBR-H resistors are ideal for applications in electronic variable speed drives as braking resistors. This allows you to control th...

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825FR10E, Ohmite

RES CHAS MNT 0.1 OHM 1% 25W

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BDS2A1003R3K, TE Connectivity

100 Watt BDS100 Series From TE Connectivity, the BDS100 series of thick film power resistors offer a virtually inductance free solution, with inductance of less than 40 nH. With a wide range of different resistance options and low tolerance of only 1%, these power resistors allow for flexibility within your designs. A power rating of 100W within a 9.5cm2 footprint gives BDS power resistors a high-power density of 10.5W/cm2. Features and Benefits: Available in 6 configurations with 2 or 4 easy to connect terminals Easy mounting Isotop case Optimum stability Space saving solution Partial dischage of less than 10pC at 2 kV guarantees quality, excellent reliability and a long life span Product Applications: Suitable applications for these thick film power resistors include snubbing and filtering. BDS100 power resistors can be used in high frequency and high-voltage applications and can also be used as balancing resistors (in a multi-resistor package). Power at 25°C 100W with heatsink, 10W without heatsink Resistance Tolerance ±10% Temperature Coefficient ≤1Ω ±250ppm/°C, >1Ω ±150ppm/°C Operating Temperature -55°C → +70°C Thermal Resistance 0.7°C/W Limiting Element Voltage 500Vdc/ac (rms) Dielectric Withstand Voltage 2000Vac Insulating Resistance 10000MΩ Maximum Inductance 40nH Length 37.8 mm Width 25.4 mm Height 15.5 mm Note 0.47Ω & 1.0Ω are 4-terminal, all other values are 2-terminal Key Characteristics Overload duration RCH25 RCH50 BDS100 BDS250 1 sec. 375W 750W 200W 1500W 2 sec. 300W 600W 150W 1250W 5 sec. 125W 250W 125W 1000W 10 sec. 75W 150W 100W 750W For each degree the ambient temperature is rais...

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FHN50 680OHMF, PCN

Metal clad resistor, 30 W (non-inductive winding) Uses lead-free, heat-resistant silicon moulding (non-flammable) Non-inductive winding improves frequency characteristics FHN50 series Rated power (@25°C) With heat sink installed 30 W Without heat sink installed 10 W Maximum operating voltage 600 V Resistance tolerance ±1% Temperature coefficient ±50ppm/°C (under 100 Ω) ±30 ppm/°C (100 Ω min.) Operating temperature range -55°C to +200°C

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HS25E3 33R F M145, Arcol

25 watt aluminium housed power resistor. Designed for direct heatsink mounting with thermal compound to achieve maximum performance. High Power to volumeWound to maximise High Pulse CapabilityValues from R005 to 100K

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RH0252R000FE02, Vishay

25 Watt RH025 Series ±1% The Vishay RH025 series wirewound chassis mount resistor has a complete welded and moulded construction for total environmental protection in aluminium housing. These resistors mount directly onto a chassis to utilize heat-sink effect. This range of wirewound resistors offers high stability at conventional power ratings and flat marking surface for easy identification. Mounts on chassis to utilize heat-sink effect Moulded construction for total environmental protection High Stability Resistance Tolerance 1% Power at 25°C 25W Resistance Tolerance 1% Temperature Coefficient 100mΩ: 100ppm/°C 1Ω: 50ppm/°C 10Ω → 15KΩ: 20ppm/°C Operating Temperature -55 → 250°C Limiting Element Voltage (P x R) 0.5 Insulating Resistance 10 000 MΩ minimum dry 1000 MΩ minimum after moisture test Length 49.23 mm Width 27.43 mm Height 13.87 mm Weight 13g

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504BA702KDG2, Arcol

Arcol Ceramic Resistors High energy Chassis mount ceramic resistor for high peak power or high energy pulses. The resistor has a standard dielectric coating and tin plated, steel right angled radial mounting tabs. Its construction acts to allow energy and power to be uniformly distributed throughout the entire ceramic resistors body. Maximum operating temperature 230°C 500 Series Non-Inductive Bulk Ceramic Slab Resistors provide high power and energy dissipation in a compact size. The 500 Series design enables the designer to minimize resistor package size and cost while providing performance and reliability. The slim, compact resistors offer a number of termination options allowing easy configuration for specific requirements. Ohmite 500 Series non-inductive bulk ceramic slab resistors provide excellent performance where high peak power or high-energy pulses must be handled in a small size. The advantage of the bulk construction is that it produces an inherently non-inductive resistor and it allows energy and power to be uniformly distributed through the entire ceramic resistor body – there is no film or wire to fail. Standard terminal mounting tabs are tin plated steel which are soldered to the resistor body. Inherently non-inductive, high reliability due to bulk ceramic construction 15 watts per inch of length power dissipation (type SP) Excellent pulse/overload capability Slim profile for excellent volumetric power efficiency Resistance range from 0.2 to 870K (resistance range dependent on material type) Resistance tolerances 5, 10, 20% standard on individual components, available to ±2% on assemblies DC Coupling and Filter Cap Discharge Voltage Balancing Pre-charge / Inrush Limit Voltage Divider Filter Snubber Crowbar Measuring EMI / EFI Test Circuits Test Loads

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