AEG A332-03

Digital guide

Model Series: A332 (AEG Residential/Commercial MCB Line)

Product Introduction:
The AEG A332-03 is a 3-pole miniature circuit breaker with a 32 A rated current and C-curve tripping characteristic (instantaneous trip at 5–10 × In). The suffix “03” denotes the specific variant/revision within the A332 product family. It is designed for final circuit protection in residential and commercial distribution boards.

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Technical Specifications:

Parameter	Value
Rated Current (In)	32 A
Pole Configuration	3-Pole (3P)
Rated Voltage (Ue)	230/400 V AC
Rated Insulation Voltage (Ui)	500 V
Tripping Curve	Type C (5–10 × In instantaneous)
Rated Short-Circuit Breaking Capacity (Icn)	6 kA at 230 V AC / 6 kA at 400 V AC
Frequency	50/60 Hz
Standards Compliance	IEC 60898-1, EN 60898-1, BS EN 60898-1
Degree of Protection	IP20
Ambient Temperature	-25°C to +70°C
Mounting	DIN 35 mm rail (EN 60715)
Mechanical Endurance	20,000 operations
Electrical Endurance	6,000 operations at rated current

Material Composition:

Housing: Self-extinguishing polyamide 6.6 (PA66), halogen-free
Terminals: Tin-plated copper alloy (CuSn6)
Contacts: Silver alloy (Ag) with arc-resistant coating
Arc Chute: Stainless steel de-ion plates (12 plates)
Trip Mechanism: Thermal bimetallic strip + magnetic solenoid
Handle: PA66 with colour-coded indicator (white = ON, red = OFF/TRIP)

Structural Features:

Standard 1-module width (17.5 mm) per pole → 3-module total width (52.5 mm)
Snap-on DIN rail mounting with secure latch
Single-lever ON/OFF toggle handle for simultaneous 3-pole switching
Clear colour-coded status indicator
Screw-clamp terminals accepting 1–25 mm² conductors
Compliant with IEC 60715 rail profile

Working Principle:
The MCB uses a combined thermal-magnetic trip mechanism. The thermal element (bimetallic strip) heats up under overload conditions, bending to release the trip mechanism after a time delay (e.g., at 1.45 × In, trip within 1 hour; at 2.55 × In, trip within 1–60 seconds). The magnetic element (solenoid plunger) responds to short-circuit currents exceeding 5–10 × In by instantaneously pulling the plunger to release the trip latch. Both mechanisms act on a common trip bar that opens all three poles simultaneously.

Functional Features:

Type C curve: Trips instantaneously at 5–10 × In (160–320 A)
Simultaneous 3-pole disconnection for complete isolation
Capacity for 1–25 mm² copper or aluminium conductors
Visible trip indication for quick fault identification
Standards-compliant selective coordination with upstream devices

Performance Parameters:

Test Condition	Value
Icn (Rated Breaking Capacity)	6,000 A (6 kA)
Trip at 1.13 × In	No trip within 1 hour
Trip at 1.45 × In	Trip within 1 hour (max)
Trip at 2.55 × In	Trip within 1–60 seconds (min/max)
Dielectric Withstand	2.5 kV AC / 1 minute
Impulse Withstand	6 kV

Advantages & Highlights:

Compact 3-pole design saves space in consumer units
Type C curve suitable for commercial loads with moderate inrush (motors, transformers, fluorescent lighting)
Halogen-free housing meets RoHS and environmental regulations
High breaking capacity (6 kA) for residential/light commercial applications
Reliable snap-on DIN rail mounting ensures secure installation

Applicable Industries:

Residential buildings (apartments, houses)
Commercial offices
Retail spaces
Light industrial workshops
School and hospital distribution boards

Installation Requirements:

Mount on standard DIN 35 mm rail (EN 60715 / IEC 60715)
Connect conductors to screw terminals (top or bottom entry)
Strip conductor insulation 8–10 mm
Torque terminal screws to 2.5 Nm
Maintain grouping per manufacturer’s derating tables when multiple MCBs are installed adjacent

Usage Precautions:

Do not use as a switch for frequent operation (not rated for switching duty)
Verify conductor size does not exceed 25 mm²
Do not install in wet locations without additional IP-rated enclosure
Replace immediately after a short-circuit trip — do not reset blindly
Check torque of terminal connections annually