Category: Hi-Rel Fuses

FM12

Features

Applications

Used in military and commercial satellites and spacecraft including manned space vehicles

  • Protection of power supplies, batteries and solar arrays
  • Isolation of redundant and branch circuits
  • Short circuit protection from fired squib and jettison circuitry

Features

  • Consistent clearing times achieved at overload currents regardless of vacuum conditions
  • Solid body construction without outgassing and not subjected to the de-rating factors of MIL-STD-975
  • Solid body construction capable of withstanding greater vibration and shock exposure without damage
  • Positive temperature coefficient of fuse element causing resistance to increase (prior to opening) thereby preventing absolute short to the power source
  • Internal construction ensuring that arc, plasma and vapor are contained within the fuse package during overload current conditions
  • High-reliability fuse series with over 29 million hours of life testing without a failure
  • Groups A/B data supplied with each shipment and Group C inspection optional

Electrical Characteristics

Fuse Part Number / Ratings

DC Resistance (Ohms) 1/

Overload Interrupt Time (Seconds) 2/

Maximum I2T (Ampere 2 Seconds) 3/

Style

Characteristic

Maximum Voltage (VDC)

Current Rating (Amps)

MIN

MAX

250%

400%

600%

250%

400%

600%

FM12

A

125V

3.0A

0.0350

0.1050

.01-.300

.0005-.015

.00005-.003

16.875

2.160

0.972

FM12

A

125V

1/8A

6.375

10.625

0-30.0

0-.015

0-.003

2.930

0.004

0.002

FM12

A

125V

4.0A

0.0300

0.0900

.01-.300

.0005-.015

.00005-.003

30.000

3.840

1.728

FM12

A

125V

5.0A

0.0220

0.6800

.01-.300

.0005-.015

.00005-.003

46.875

6.000

2.700

FM12

A

72 V

1/8A

6.375

10.625

0-30.0

0-.015

0-.003

2.930

0.004

0.002

FM12

A

72 V

1/4A

1.875

3.125

0-30.0

0-.015

0-.003

11.719

0.015

0.007

FM12

A

72 V

3/8A

1.125

1.875

.01-.300

.001-.015

.00015-.003

0.264

0.034

0.015

FM12

A

72 V

1/2A

0.675

1.125

.01-.300

.001-.015

.00015-.003

0.469

0.060

0.027

FM12

A

72 V

3/4A

0.225

0.375

.01-.300

.001-.015

.00015-.003

1.055

0.135

0.061

FM12

A

72 V

1A

0.135

0.225

.01-.300

.001-.015

.00015-.003

1.875

0.240

0.108

FM12

A

72 V

1.5A

0.097

0.163

.01-.300

.001-.015

.00015-.003

4.219

0.540

0.243

FM12

A

72 V

2.0A

0.045

0.075

.01-.300

.001-.015

.00015-.003

7.500

0.960

0.432

FM12

A

125V

1/4A

1.875

3.125

0-30.0

0-.015

0-.003

11.719

0.015

0.007

FM12

A

72 V

3.0A

0.0262

0.0438

.01-.300

.001-.015

.00015-.003

16.875

2.160

0.972

FM12

A

125V

3/8A

1.125

1.875

.01-.300

.0005-.015

.00005-.003

0.264

0.034

0.015

FM12

A

72 V

4.0A

0.0195

0.0325

.01-.300

.001-.015

.00015-.003

30.000

3.840

1.728

FM12

A

125V

1/2A

0.675

1.125

.01-.300

.0005-.015

.00005-.003

0.469

0.060

0.027

FM12

A

72 V

5.0A

0.0135

0.0225

.01-.300

.001-.015

.00015-.003

46.875

6.000

2.700

FM12

A

125V

3/4A

0.225

0.375

.01-.300

.0005-.015

.00005-.003

1.055

0.135

0.061

FM12

A

72 V

6.0A

0.0112

0.0188

.01-.300

.001-.015

.00015-.003

67.500

8.640

3.888

FM12

A

125V

1A

0.090

0.270

.01-.300

.0005-.015

.00005-.003

1.875

0.240

0.108

FM12

A

72 V

7.5A

0.0082

0.0138

.01-.300

.001-.015

.00015-.003

105.469

13.500

6.075

FM12

A

125V

1.5A

0.0850

0.2250

.01-.300

.0005-.015

.00005-.003

4.219

0.540

0.243

FM12

A

72 V

10A

0.0063

0.0107

.01-.300

.001-.015

.00015-.003

187.500

24.000

10.800

FM12

A

125V

2.0A

0.0450

0.1350

.01-.300

.0005-.015

.00005-.003

7.500

0.960

0.432

FM12

A

72 V

15A

0.0038

0.0070

.01-.300

.001-.015

.00015-.003

421.875

54.000

24.300