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Standoff Insulators

UL Recognized Electrical Bus Bar Insulating Standoffs:

Hi-Pot Tested to assure electrical reliability, Storm's high-voltage insulators are UL-recognized according to UL Standard for Safety 891.

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Standoff Insulators Thermoset Polyester

**Due to import tariffs on certain insulators, some prices have changed.

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Storm Part Number Glastic® Part No. Indoor Voltage Shape Diameter Height Insert Size Insert Type Weight in lbs. Price Each
1100-A1 2165-1A 600 Hex 1 1 1/4-20 x 5/16 Aluminum .058 $ 4.01
1100-A1/M6* 2165-3A 600 Hex 25mm 25mm M6 x 1.0 x 11.1 Aluminum .058 $ 5.48
1125-A1 2165-1B 600 Hex 1 1-1/4 1/4-20 x 5/16 Aluminum .072 $ 4.01
R2137-A4 1603-2A 1500 Round 1-3/4 1-3/8 3/8-16 x 3/8 Aluminum .178 $ 6.88
3213-A5 1461-1A 2500 Round 2-1/2 2-1/8 3/8-16 x 9/16 Aluminum .59 $13.80
3213-A6 1461-1B 2500 Round 2-1/2 2-1/8 1/2-13 x 5/8 Aluminum .57 $14.82
3213-S8 1461-1C 2500 Round 2-1/2 2-1/8 5/8-11 x 3/4 Steel .684 $17.42
R4150-A3 2015-2A 1500 Round 1-3/4 1-1/2 5/16-18 x 3/8 Aluminum .204 $ 7.44
R4150-A4 2015-3A 1500 Round 1-3/4 1-1/2 3/8-16 x 3/8 Aluminum .196 $ 7.08
UV4150-A4** 2015-3A 1500 Octagon 2 1-1/2 3/8-16 x 3/8 Aluminum .196 $ 8.42
4150-A4 2015-3A 1500 Octagon 2 1-1/2 3/8-16 x 3/8 Aluminum .196 $ 8.02
R4150-A4 MB5500*** 2015-3A 1500 Round 1-3/4 1-1/2 3/8-16 x 3/8 Aluminum .21 $ 7.08
4150-S2 2015-1A 1500 Octagon 2 1-1/2 1/4-20 x 7/16 Steel .22 $ 9.57
4150-S4 2015-3A 1500 Octagon 2 1-1/2 3/8-16 x 3/8 Steel .226 $ 9.29
R4175-A3 2015-2B 2000 Round 1-3/4 1-3/4 5/16-18 x 3/8 Aluminum .24 $ 6.34
R4175-A4 2015-3B 2000 Round 1-3/4 1-3/4 3/8-16 x 3/8 Aluminum .24 $ 7.40
R4200-A3 2015-2C 2500 Round 1-3/4 2 5/16-18 x 3/8 Aluminum .276 $ 7.53
R4200-A5 2015-3C 2500 Round 1-3/4 2 3/8-16 x 9/16 Aluminum .346 $ 7.89
4200-A5-M10* 2500 Octagon 2 2 M10x1.50x14.2 Aluminum .266 $ 9.88
R4200-A5UV 2015-3C 2500 Round 1-3/4 2 3/8-16 x 9/16 Aluminum .282 $ 8.59
4200-S5 2015-3C 2500 Octagon 2 2 3/8-16 x 9/16 Steel .344 $10.04
4200-S5/M10* 2500 Octagon 2 2 M10x1.50x14.2 Steel .344 $ 9.31
4200-A3 2015-2C 2500 Octagon 2 2 5/16-18 x 3/8 Aluminum .348 $ 9.67
4200-A5 2015-3C 2500 Octagon 2 2 3/8-16 x 9/16 Aluminum .266 $ 9.62
4200-A5-BLACK 2015-3C 2500 Octagon 2 2 3/8-16 x 9/16 Aluminum .266 $ 8.62
4200-A6 2015-4C 2500 Octagon 2 2 1/2-13 x 5/8 Aluminum .298 $10.43
4200-S3 2015-2C 2500 Octagon 2 2 5/16-18 x 3/8 Steel .342 $11.21
R4200-S5 2015-3C 2500 Round 1-3/4 2 3/8-16 x 9/16 Steel .276 $ 7.60
4200-S6 2015-4C 2500 Octagon 2 2 1/2-13 x 5/8 Steel .384 $10.73
4225-A5 2015-3D 2700 Octagon 2 2-1/4 3/8-16 x 9/16 Aluminum .35 $ 9.78
4225-A6 2015-4D 2700 Octagon 2 2-1/4 1/2-13 x 5/8 Aluminum .358 $10.88
4225-S5 2015-3D 2700 Octagon 2 2-1/4 3/8-16 x 9/16 Steel .406 $10.07
4225-S6 2015-4D 2700 Octagon 2 2-1/4 1/2-13 x 5/8 Steel .442 $11.04
5250-A5 1872-1A 3200 Octagon 2-1/2 2-1/2 3/8-16 x 9/16 Aluminum .42 $10.05
5250-A6 1872-2A 3200 Octagon 2-1/2 2-1/2 1/2-13 x 5/8 Aluminum .422 $10.84
5263-A8 1872-3F 3400 Octagon 2-1/2 2-5/8 5/8-11 x 3/4 Aluminum .45 $11.40
5263-S8 1872-3F 3400 Octagon 2-1/2 2-5/8 5/8-11 x 3/4 Steel .568 $12.05
5275-A5 1872-1B 3600 Octagon 2-1/2 2-3/4 3/8-16 x 9/16 Aluminum .586 $10.48
5275-A6 1872-2B 3600 Octagon 2-1/2 2-3/4 1/2-13 x 5/8 Aluminum .50 $10.95
5300-A5 1872-1C 4100 Octagon 2-1/2 3 3/8-16 x 9/16 Aluminum .59 $10.77
5300-A6 1872-2C 4100 Octagon 2-1/2 3 1/2-13 x 5/8 Aluminum .59 $11.16
5325-A5 1872-1D 4500 Octagon 2-1/2 3-1/4 3/8-16 x 9/16 Aluminum .674 $10.77
5350-A5 1872-1E 5000 Octagon 2-1/2 3-1/2 3/8-16 x 9/16 Aluminum .764 $11.47
5350-A6 1872-2E 5000 Octagon 2-1/2 3-1/2 1/2-13 x 5/8 Aluminum .76 $11.89
6350-S10 1642-10E 5000 Round 3-3/4 3-1/2 3/8-16 x 5/8 Steel 1.72 $17.77
6350-S10 4X4 1642-10E 5000 Round 3-3/4 3-1/2 3/8-16 x 5/8 Steel 1.84 $19.37
6350-S10 4x4x1 5000 Round 3-3/4 3-1/2 1/2-13 x 5/8 Steel 1.0 $19.37
6500-S10 N/A 7500 Round 2-3/4 5 3/8-16 x 5/8 Steel 1.726 $26.64
6600-S10 2450-11 15000 Round 3-3/4 6 3/8-16 x 5/8 Steel 2.0 $20.27
6600-S10 4X4 RED 2450-11 15000 Round 3-3/4 6 3/8-16 x 5/8 Steel 2.0 $23.08

* M = mm (millimeters)
** UV = Ultra-Violet Protective Coating
***High Temperature - Up to 160°C

Storm Power's Standoff Insulators Are Available in Molded Polyester, High Temperature Ceramic, or Fiberglass-Reinforced with UV Coating:

Part
Number
Shape Diameter Height Insert Size Material Weight
in lbs.
Price
Each
C4150-4 Round 1.75" 1.50" 3/8-16 x 3/8" Ceramic 1.0 $29.17 C4150 ceramic insulator
C4200-5 Round 1.75" 2.00" 3/8-16 x 9/16" Ceramic 1.0 $20.83 ceramic standoff insulator withstands very high temperatures

♦ 1700° F maximum temperature

polyester standoff insulator
Polyester Standoff Insulators For Indoor Use in Low-Voltage Applications with Lower Temperatures
ceramic standoff insulator withstands very high temperatures
Ceramic Standoff Insulators For High-Voltage Applications with High Temperatures
uv protected standoff insulator
UV Coated Polyester Insulators For Indoor Applications Protects from UV Radiation

Standoff Insulators Mounted on Bus Bar KitStorm Power's Most Popular Reinforced-Polyester Standoff Insulators

Also known as Glastic® or Mar-Bal™ Standoff Insulators, Storm's High Voltage Insulators are made from fiberglass-reinforced thermo-set polyester, a bonded material with higher moisture and heat tolerance than plastic insulators and molded for high-strength, . This material also offers greater mechanical strength to enable electrical installers to crank up closer height tolerances than with porcelain insulators, making Storm's standoff insulators more suitable for ground bar and perimeter grounding applications.

Flame retardant and track resistant glass reinforced thermoset polyester molding compound recognized for current carrying devices under UL Material Recognition Number E 80533(N) and UL File E84767. They combine high mechanical strength with high arc resistance and dielectric properties at elevated temperatures and humidity. These shatter resistant insulators meet the most exacting standards for a variety of applications.

Poly Standoff Insulators are also sold with Storm's Ground Bar Kits.

Physical and Electrical Properties of Bus Bar Insulators

Tensile strength is the amount of stress that the insulator will withstand when pressure is applied pulling straight up on the bolt in the insert.

Cantilever strength is the amount of weight an insulator will support when something is hung on an insulator that is mounted on the wall.

Compression strength is the amount of weight an insulator will support in a direct vertical application of pressure.

Dielectric strength is another term for insulating properties.

Arc resistance is expressed as the number of seconds that a material resists the formation of a surface-conducting path when subjected to an intermittently occurring arc of high voltage, low current characteristics.

A standoff insulator's height determines the distance that will separate a source of voltage from ground or other components. Since an electric current will jump across a gap, the greater the voltage, the greater the distance required for safety.

Thread size and insert material. Standoff insulators come with threaded metal inserts for mounting onto walls or cabinets. Several different thread sizes are offered for each size insulator, to accommodate a wide variety of applications and attachment bolts.  The most popular metal for inserts is aluminum, because it doesn’t rust. Steel inserts are generally used only for applications requiring a high torque on mounting bolts.