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1.3.4 SafetyHub 150 (AUX Battery)

Blue Sea SafetyHub 150

Type: Fuse Block

Model: Blue Sea 7748 SafetyHub 150

Manufacturer: Blue Sea Systems

Product Page: SafetyHub 150 Fuse Block

Overview

Provides fused distribution for recovery and auxiliary systems powered by the AUX battery.

Location: Passenger rear wheel well (co-located with AUX battery and circuit breakers)

Power Source: AUX battery+ via inline 150A CB (~2 ft, local in rear wheel well) - see Circuit Breakers

Note: Communications systems (GMRS, Intercom) are powered via PMU outputs - see PMU Outputs

Future-Proof Capacity

Wire and CB sized for full 150A SafetyHub capacity (current load 100A). Provides 50A headroom for additional recovery or auxiliary systems.

Specifications

  • Rating: 150A max combined (400A bus rating)
  • Fuse Types: 3x MIDI (AMI/MIDI), 4x ATC (ATO/ATC)
  • Fuse Range: MIDI: 30-200A, ATC: 1-20A per circuit
  • Features: Ignition protected, negative ground bus, ISO 8846, SAE J1171, IP66
  • Full Specs: Blue Sea 7748

Circuit Configuration

Slot Fuse Circuit Wire Gauge Distance Voltage @ Load Load Notes
MIDI-1 60A ARB Compressor Motor 1 6 AWG ✓ ~12 ft 11.56V (3.6%) 45A Passenger rear wheel well → cargo → under passenger seat
MIDI-2 60A ARB Compressor Motor 2 6 AWG ✓ ~12 ft 11.56V (3.6%) 45A Passenger rear wheel well → cargo → under passenger seat
MIDI-3 - [Available] - - - - -
ATC-1 - [Available] - - - - (Was Winch Contactor Trigger - reallocated 2026-05-30 to BODY PDU CB43 for shorter routing; see Winch and Dashboard Controls)
ATC-2 - [Available] - - - - -
ATC-3 - [Available] - - - - -
ATC-4 - [Available] - - - - -

Slot Utilization: 2 of 7 used (2 MIDI, 5 available — ATC-1 freed after winch trigger reallocated to BODY PDU CB43)

Total Load: 100A maximum (ARB 90A + Winch Trigger 10A)

Utilization: 100A / 150A = 67%

Future Capacity: 50A additional capacity available (150A max - 100A current = 50A headroom)

Winch Main Power

Winch motor power (400A peak) connects directly to AUX battery positive terminal with no external circuit breaker per WARN manufacturer specifications. See STANDARDS-EXCEPTIONS.md and Recovery Systems for complete protection strategy.

Power Systems:

Connected Systems: