Siemens Circuit breaker, D-curve, 3-pole, 10kA, 32A Part number 5SJ4332-8HG42

Product Overview

The Siemens 5SJ4332-8HG42 is the Siemens SENTRON 5SJ4 Miniature Circuit Breaker 3-pole, 32 A, D-characteristic. It is a compact and robust overcurrent protection device designed for three-phase circuits, providing thermal-magnetic protection against overloads and short-circuits, suitable for industrial and commercial power distribution applications.

Key Features

• 3-pole miniature circuit breaker (MCB, SENTRON 5SJ4 series)
• Rated current: 32 A (at 30–40 °C ambient)
• Tripping characteristic: D — suitable for circuits with moderate inrush currents (e.g. motors, transformers, inductive loads)
• Rated operational AC voltage up to 400 V (insulation up to 440 V AC); DC rating up to 60 V (single-channel) / 125 V (multi-channel)
• Breaking capacity: 10 kA (per EN 60898) / 15 kA (per IEC 60947-2) — adequate for typical industrial short-circuit levels
• Touch-protected terminals and halogen-free, silicon-free materials — suitable for safety and industrial environments
• Sealable handle — allows locking OFF for maintenance or safety lock-out
• Compatible with standard 35 mm DIN-rail mounting — easy installation in control panels or distribution boards
• Compact modular width: 3 units — fits standard switchboards and enclosure layouts

Technical Specifications

• Article Number: 5SJ4332-8HG42
• Series: SENTRON 5SJ4 miniature circuit breakers
• Poles: 3 (three-phase)
• Rated Current (In): 32 A
• Tripping Curve: D-characteristic (10–20 × In for magnetic trip)
• Rated Operational AC Voltage (Ue): 400 V AC (insulation up to 440 V AC)
• Rated DC Voltage (Ue DC): 60 V DC (single channel), 125 V DC (multi-channel)
• Breaking Capacity (Icu / Ics): 10 kA (EN 60898) / 15 kA (IEC 60947-2)
• Connection Terminals: Screw/clamp terminals; conductor cross-section supported typically 0.75 … 25 mm²
• Terminal Tightening Torque: ~3.5 N·m
• Mounting: DIN-rail (35 mm), any mounting position allowed
• Modular Width: 3 units (≈ 54 mm)
• Approvals / Standards: EN/IEC 60898-1, IEC 60947-2, UL 489, CSA C22.2
• Operating Environment: Pollution Degree 3, Overvoltage Category III; suitable for industrial or commercial distribution boards
• Ambient Operating Temperature / Derating: Rated at 32 A at 30–40 °C; derated at higher ambient temperature (e.g. ~30.4 A at 50 °C, ~28.8 A at 60 °C)

Compliance & Certifications

• Compliant with international standards for miniature circuit breakers (EN/IEC 60898-1, IEC 60947-2)
• UL 489 and CSA certified for North-American type AC/DC circuits (480Y/277 V AC, up to 60/125 V DC)
• Suitable for industrial, commercial, and building power distribution systems requiring reliable overload and short-circuit protection

Applications

The 5SJ4332-8HG42 is ideal for protecting three-phase branch circuits in power distribution boards, switchgear, motor control installations, or any industrial or commercial electrical distribution requiring 32 A protection with D-type trip characteristic. It is particularly suitable for circuits with inductive loads — such as motors, transformers, or equipment with high inrush currents — where a D-characteristic breaker ensures reliable protection without nuisance tripping. It can also be used in general power circuits, lighting and socket circuits in industrial or commercial buildings.