DZ74-63 Series 3P 10A Mini Circuit Breaker Switch

DZ74-63 Series 3P 10A Mini Circuit Breaker Switch Electrical engineers, industrial panel builders, and automation technicians utilize this three-pole (3P) 10A miniature circuit breaker to safeguard three-phase electrical systems against dangerous overloads and short circuits. Consequently, it provides simultaneous multi-line interruption, immediately disconnecting all three active phases if an overcurrent fault is detected on any single branch. Therefore, this DIN rail-mounted safety switch serves as a critical protection asset for three-phase motor circuits, industrial machinery control blocks, and commercial distribution boards.

Key Features:

• Simultaneous 3-Pole Tripping: Features an integrated internal trip bar that ensures all three poles disconnect simultaneously, preventing dangerous single-phasing conditions in three-phase motors.
• Advanced Thermal-Magnetic Protection: Engineered with responsive bi-metallic elements for long-term overcurrent tracking alongside a fast magnetic coil for instantaneous short-circuit fault clearing.
• Standard 35mm DIN Rail Mount: Designed with a heavy-duty, spring-loaded rear clip for rapid, toolless snap-on installation into industrial control enclosures.
• High Breaking Capacity: Capable of safely interrupting fault currents up to 4500A (4.5 kA) to prevent arc-flash damage and preserve downstream component integrity.
• Rugged Flame-Retardant Shell: Encased in a high-impact, self-extinguishing polymer housing engineered to withstand elevated thermal stress and harsh industrial environments.

Technical Specifications:

• Model Classification: DZ74-63 / DZ47-63 Series style.
• Number of Poles: 3P (Three Pole / Triple Pole).
• Rated Current (In): 10 A.
• Rated Operating Voltage (Ue): 400V AC.
• Rated Breaking Capacity: 4500 A (4.5 kA).
• Tripping Characteristic Curve: C-Type (Standard inductive and motor load protection curve).
• Rated Frequency: 50 Hz / 60 Hz.
• Mechanical Endurance: ≥ 10,000 operations.
• Electrical Endurance: ≥ 4,000 operations.

Mechanical Specifications:

• Mounting Arrangement: Snap-fit assembly onto standard 35 mm DIN rails.
• Terminal Clamping Style: Deep combination box tunnel terminals with high-torque steel screws.
• Wire Cross-Section Compatibility: Accommodates solid or stranded conductors from 1.5 mm² up to 25 mm².
• Ingress Protection Rating: IP20 (Finger-safe terminal shroud layout).

Dimensions:

• Module Width: ≈ 54.00 mm (Standard triple-pole 3-mod width footprint).
• Overall Height: ≈ 80.00 mm.
• Total Profile Depth: ≈ 75.00 mm.
• Unit Weight: ≈ 245.00 g.

Pinout and Wiring:

• Top Terminals (1, 3, 5 – Line/Input): Accepts the three incoming active live phases (L1, L2, L3) from the primary supply or busbar system.
• Bottom Terminals (2, 4, 6 – Load/Output): Connects directly to the three corresponding lines routing balanced three-phase energy downstream to the load.

Datasheet Reference: Download Datasheet

• DZ74-63 3P 10A Miniature Circuit Breaker Dimensional Drawings and Thermal Tripping Profiles

Commonly Used in:

• Three-Phase Motor Starters: Providing local branch short-circuit protection ahead of contactors and overload relays in pump or fan installations.
• Industrial Machinery Controls: Serving as the main or sub-circuit isolation breaker for small machine tools, conveyor lines, and industrial packaging systems.
• HVAC Equipment Panels: Guarding commercial three-phase air conditioning compressors, multi-stage ventilation systems, and heating banks.

Applications:

• Three-Phase Circuit Protection: Shielding continuous inductive and resistive loads against unexpected multi-phase electrical grid faults. However, failing to fully torque the terminal screws during deployment can cause severe localized heating and premature nuisance tripping under balanced loads; therefore, field technicians must follow recommended torque parameters and verify clean wire insertion.

Equivalent Models:

• DZ74-63 3P 16A Circuit Breaker: A physically identical three-pole variant calibrated to manage higher continuous current lines up to 16A.
• DZ74-63 1P 10A Circuit Breaker: A compact single-pole option intended solely for individual single-phase 10A branch loops.

Package Includes:

• 1 × DZ74-63 Series 3P Miniature Circuit Breaker (10A)