POWER FUSE & POWER RELAY MODULES (PFM/PRM)
Bussmann
IP66
These distribution modules are designed for high current applications and suitable for placement in
extreme moisture and high vibration environments. A silicone seal and included removable fuse
cover offer a weather-tight enclosure for the fuse positions. Both modules feature rugged M8 power
input studs. Multiple units may be connected together using a buss bar . They can also be bussed to
any of Bussmann's PDMs (i.e. VEC / DVEC - p.124 , 153 03 Series RTMR - p.112 etc.)
The PFM contains 2 female fuses , each a separate circuit.
The PRM contains a molded-in relay and 2 female fuse positions.
For the PRM: One fuse protects the relay and the other is a single-circuit inline fuse.
Power Fuse Module (PFM)
Part Number
37701-1NN0025
37702-1AN0025
37703-1AN0025
50126K
3771BUS-2
3771BUS-3
3771BUS-4
B162-7003/J
B162-700 2 /J
Power Relay Module (PRM)
Includes High Power Mini Relay
Description
32V Power Fuse Module ( PFM )
12V Power Relay Module ( PRM )
24V Power Relay Module ( PRM )
PRM Relay Signal Connector Kit
Twin Bus Bar With Stud Covers
Triple Bus Bar With Stud Covers
Quad Bus Bar With Stud Covers
Short Joiners / Output Stud Barriers
Long Joiners / Output Stud Barriers
Fuse Cover
(Included)
Input
Stud
JTF Fusible Links
(20A - 60A)
Fuse
Fuse
30
85
86
87
Power
Relay
Rating (PFM): Each inline fuse; up to 60A.
Relay Rating (PRM): 70A ( 12VDC ) or 25A (24VDC) steady-state relay .
Relay protection fuse; up to 60A. Non-switched inline fuse; up to 60A.
Temperature Rating: -40 °C to +85 °C.
Body: UL-Rated 94V-0 thermoplastic with Silicone seal.
Terminals: Tin-plated copper terminals.
Studs: Plated steel. Includes Keps nuts.
Input Termination: M8 threaded stud.
Output Termination: Two M6 threaded studs.
Relay Si gnal C onnector Kit : 50126K as above, for use with PRM.
Ingress Protection Rating: IP66 (excluding stud connections).
Mounting: Counter R otation F eature (CRF) included to prevent the
module rotatin g on single bolt installations .
Bussing: Use 3771BUS busbars to join multiple PRMs/PFMs.
Stud insulator caps included with busbars.
Contact sales for o ptions to bus PRMs/PFMs to other Bussmann PDM’s .
Accessories: Relay signal connector, bus bars, s tud caps, separators and
service components.
Suitable Fuses: JTFxxx (20A - 60A), not included.
Notes: Each Power Relay Module requires 1 x PRM Relay Signal
Connector Kit (50126K) to control the relay.
PRM Relay Signal
Connector Kit
Power Relay Module (PRM)
Wiring Diagram
Joiners / Output
Stud Barriers
Signal
Signal
Output
Stud
Output
Stud
i
Multiple modules
joined with an
optional Bus Bar
Bus Bar
With Caps
Includes terminals
& cable seals
Datasheet: 9002
Page: 1
POWER FUSE / POWER RELAY MODULES (PFM/PRM) - cont’d
Bussmann
Power Fuse Module
37701
6.5x35.4 Mount Hole
M6x20 Stud (x2)
M8x20 Stud
13.04
19.19
20
o6
40
1.0
o6.5
Counter rotation feature
Dimensions in MM
121.21
7.0
xx
44
20
NON-SWITCHED FUSE
OUTPUT STUD/BLADE
xx
51
INPUT STUD
NON-SWITCHED FUSE
OUTPUT STUD/BLADE
60.62
12
Power Relay Modules
37702 / 37703
M8x20 Stud
6.5x35.4 Mount Hole
13.04
19.19
20
40
o6.5
o6
11.09
1.0
PRM Fitted With
Output Connector
121.21
Counter rotation feature
5.38
7.0
50.9
57.9
20
60.62
12
M8x20 Stud
6.5x35.4 Mount Hole
M6x20 Stud (x2)
13.04
19.19
20
40
1.0
o6.5
o6
121.21
Counter rotation feature
PRM Fitted With
Two Output Studs
7.0
50.9
57.9
20
60.62
12
Dimensions in MM
PRM Circuit Diagram
Datasheet: 9002
Page: 2
POWER FUSE / POWER RELAY MODULES (PFM/PRM) - cont’d
37701-1AN0000
Bussmann
Further Factory Options
Part Number Construction
Series
Module
Type
Output Signal
1- PFM
1- Stud (Delphi)*
2- 12V PRM 2- Connector (Amp)
3- 24V PRM 3- Stud (Delphi)
4- Connector (Amp)
Signal Key
PRM only
N - None
A - Black
B - Grey
C - Green
F - Red
Y - Yellow
Stud Output Left Fuse
Key
Value
N - None
0 - No Fuse
A - Black
2 - 20A
B - Grey
3 - 30A
4 - 40A
5 - 50A
6 - 60A
Ordering Notes
* PFM always uses this option
CRF = Counter Rotation Feature
Right Fuse
Value
Cover Option
0 - No Fuse 0 - No Cover
2 - 20A
1 - Cover (bulk)
3 - 30A
2 - Cover (assem)
4 - 40A
5 - 50A
Hardware
6 - 60A
0 - No hardware
1 - Nuts (bulk)
2 - Nuts (assem)
3 - CRF
4 - CRF, nuts (bulk)
5 - CRF, nuts (assem)
Power Relay Module (PRM)
Relay Signal
Connector
Output #1
(JTF Fuse)
Output #1 Stud
(not switched by relay)
Output #2 Stud
(switched by relay)
Input Stud
Output #2
(JTF Fuse)
Power Fuse Module (PFM)
Output #1 Stud
Output #1
(JTF Fuse)
Output #2 Stud
Input Stud
Both units include
a removable water
tight fuse cover.
Datasheet: 9002
Output #2
(JTF Fuse)
Page: 3
POWER FUSE / POWER RELAY MODULES (PFM/PRM) - cont’d
Bussmann
PFM / PRM 3771 BUS BAR
Dimensions
A
B
66
41
108
41
150
41
Description
2 Way Bus Bar
3 Way Bus Bar
4 Way Bus Bar
Part Number
3771BUS-2
3771BUS-3
3771BUS-4
Body: Copper
Voltage: 58VDC
Rating: 300A
Price & Pack Size: Please contact sales .
Notes: 4 Way Bus Bar schematic not shown, contact sales for more information.
3771BUS-2
2 x Power Relay
module input studs
bussed by one
3771BUS-2.
3771BUS-3
32
O8
29
86
12
8.5
22
B
A
B
Dimensions in MM
15
15
5.3
Datasheet: 9002
B
A
2.1
5.3
2.1
Page: 4