Product Datasheet
SL SERIES POWER DISTRIBUTION MODULES
PN 880076 with remote switching and
manual control
PN 880075 with remote switching
SL Series Specifications
Voltage (nominal):
12V DC
300A at 85°C
240A at 105°C
-50° C to +105° C
IP66
50 G
8G
4/0 AWG (120 mm²)
M8 (5/16”)
M8 x 1.25
15 ft-lb (20.3 N-m)
880075 1.4lbs (0.64kg)
880076 1.5lbs (0.68kg)
9mm (for M8 hardware)
Max Total Amperage Rating:
Operating Temp:
Ingress Protection:
Shock:
Vibration
Minimum Input Cable Size to Meet Ratings:
Recommended Ring Terminal:
Stud Size:
Stud Torque:
Weight:
Mounting Holes:
Description
High-amp circuits can be disconnected with remote switch
SL PDM (PN 880075) or manual/remote switch SL PDM
(PN 880076). Manual knob enables emergency battery
disconnection or provides positive lock-out for vehicle
servicing. Ideal for low-amp circuits including clock memory,
alarms, tachograph, and Qualcomm modules; and for high-
amp circuits such as vehicle control modules, inverters, and
auxiliary circuits.
Ignition protected to SAE J1171 and ISO 8846 for installation
in a battery box, or on vehicles carrying hazardous loads.
Water and dust-resistant to IP59K, permitting high
temperature, high-pressure washing. Provides the benefits
of a sealed cover, but allows water to escape if the cover
is mistakenly unsecured. Tin-plated copper studs provide
maximum conductivity and significantly lower contact
resistance. Stainless steel hardware provides superior
corrosion resistance. Also available with pre-installed fuses
to customer needs.
These products are customer-limited. Please consult
Littelfuse for details. Fuses sold separately.
Internal Battery Switch Specifications
Continuous Amperage Rating:
Cranking Rating:
240A
10 sec. 1,000A
MIDI
®
Fuse Block Specifications
Amperage Maximum Operating (per block):
Amperage Maximum Operating (per circuit):
Fuse Amperages Available:
Minimum Cable Size to Meet Ratings:
Screw Size:
Screw Torque:
240A
170A
30A–200A
2/0 AWG (70 mm²)
M5 x .8 x 10
27 in-lb (3.0 N-m)
Features and Benefits
• Provides main battery shutdown from a remote location.
• Optional manual control knob switches high-amp circuits.
• Three switched 30A to 200A MIDI fuse locations.
®
• Four unswitched 24-hour 1A-20A ATO fuse locations.
®
• Eliminates significant factory or field interconnections.
ATO
®
Fuse Block Specifications
Amperage Maximum Operating (per block):
Amperage Maximum Operating (per circuit):
Fuse Amperages Available:
50A
20A
1A–20A
Ordering Information
PART NUMBER
880075
880076
DESCRIPTION
SL PDM
SL PDM with knob
Input Wire Size and Current Derating Table
AWG WIRE SIZE
4/0 AWG
2/0 AWG
METRIC WIRE SIZE
120 mm²
70 mm²
50 mm²
25 mm²
AMPERAGE MAXIMUM
OPERATING (COMBINED)
280A
240A
180A
125A
Web Resources
Download technical resources at:
littelfuse.com/SL
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1 AWG
4 AWG
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© 2018 Littelfuse Commercial Vehicle Products
Rev: 041118
Product Datasheet
SL SERIES POWER DISTRIBUTION MODULES
Operating Instructions
The SafetyHub 250 uses a SPDT ON-ON Remote Control
Switch for control from a remote location. The Remote
Control Switch should be mounted in a convenient location
for quick access.
ACTION
To switch the battery
bank and high-amperage
circuits
ON
OPERATIONS
Depress the top part
of the Remote Control
Switch actuator.
LED INDICATION
LEDs on switch and block
illuminate, indicating that
switched circuits are
ON.
Installation Instructions
Install the SafetyHub in a readily accessible location as close
as possible to thebattery. Mount in a dry and protected
location. Avoid mounting directly above vented lead acid
batteries so that the SafetyHub is not exposed to corrosive
gasses from the batteries.
Where possible, mount the SafetyHub in a vertical
orientation. (See illustration 1.1 below)
To switch the battery Depress the bottom part LEDs on switch and block do
bank and high-amperage of the Remote Control not illuminate, indicating that
circuits
OFF
Switch actuator.
switched circuits are
OFF
High Current Input/Remote Battery
Switch Connection
Connect the positive battery terminal to the input stud on the
SafetyHub. Torque the connection to 15 ft-lb.
The manual control override knob overrides the Remote Control
Switch and provides:
• An added level of safety that allows manual ON-OFF control
with or without power
• LOCK OFF position for servicing the electrical system or to
disconnect the battery bank and high-amperage circuits in an
emergency
High-Amperage Switched Fuse Circuit Connections
To connect high amperage loads such as an engine starting
circuit, distribution panel, or windlass, use the numbered high
amperage studs.
CAUTION: Do not switch the Remote Control Switch to OFF while
the engine is running!
Unswitched Fused Circuits
Fused circuits A, B, C, and D are always on 24-hour, (non-
switched), regardless of the Remote Control Switch and
manual override switch states (see Illustration 1.2 - System
Diagram on reverse side).
Unswitched Fused Circuit Connections
The fuse connections labeled with letters are designed to be
used for circuits that are always on.
Control Circuit Connections
(wires contained in the wire harness)
NOTE:
The SafetyHub is designed to be controlled by the
Remote Control Switch. Use minimum 18 AWG (1.5mm²) wire
for the control circuit.
Fuses
Unlatch the two yellow tabs on the fuse cover to
access fuses.
The ATO
®
Fuse Block of the SafetyHub 250 is used for 24-
hour (non-switched) circuits. The total continuous amperage
of this block must not exceed 50A.
The MIDI
®
Fuse Block of the SafetyHub 250 is used for the
switched circuits. The total continuous amperage of this block
must not exceed 240A.
Manual Control Override Operations
ACTION
To switch the
SafetyHub 250
ON
To switch the
SafetyHub 250
OFF
To switch the
SafetyHub 250 back
to
READY
To prevent remote
operation of the
SafetyHub 250 for
SERVICE LOCKOUT
A
B
C
D
Battery bank and high-amp switched circuits 1,2, and 3 only:
OPERATION
Turn manual control knob to the
ON
position and push button
until latched.
Rotate manual control knob
to the
OFF
(red) position
(switch contacts open).
Rotate manual control
knob back to the
ON
position.
Rotate manual control knob
to the
OFF
(red) position.
Four 24-Hour
Circuits Connect
to Devices
using
ATO Fuse
Connector Plug
Accepts Four
1A-20A ATO Fuses
Accepts Up To Three
30A-200A MIDI Fuses
MOUNTING
HOLES X2
1
2
3
Use MIDI Fuses for Switched Circuits
Use Engine Link Bus for Switched Engine Circuit or MIDI Fuse
Visit
Littelfuse.com
for the most up-to-date product information. Littelfuse products are designed for specific applications and should not be used for any purpose (including, without limitation, automotive applications)
not expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse product
documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse product documentation.
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