Technical Review: Delixi DZ47s 1P D 32A 6KA MCB - Selection Guide & Specs
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Overview: Preventing Motor Burnout and Nuisance Tripping
The Delixi DZ47s 1P D 32A 6KA miniature circuit breaker addresses a critical industrial challenge: protecting electrical circuits from both overload conditions and high inrush currents without causing nuisance tripping. This D-curve MCB is specifically engineered for applications with substantial motor starting currents, such as industrial pumps, compressors, and machinery where standard breakers would trip unnecessarily during startup.
As a single-pole (1P) device rated at 32A with 6KA breaking capacity, this circuit breaker provides reliable protection for circuits operating at 230/400VAC. The "D" trip curve designation indicates it's optimized for equipment with high inrush currents, making it ideal for industrial environments where motor-driven equipment is prevalent. For comprehensive electrical protection solutions, explore our full range of Circuit Breakers and Electrical Protection devices.
Technical Specifications Analysis
| Specification | Value | Description |
|---|---|---|
| Model Number | DZ47SN1D32 | Delixi DZ47s series, 1P, D curve, 32A rating |
| Rated Current | 32A | Continuous current carrying capacity |
| Breaking Capacity | 6KA (6000A) | Maximum short-circuit current interruption |
| Rated Voltage | 230/400VAC | Operating voltage range |
| Frequency | 50/60Hz | Compatible with standard AC frequencies |
| Number of Poles | 1P (Single Pole) | Protects single phase circuits |
| Trip Curve | Type D | 10-20x rated current magnetic trip range |
| Thermal Protection | Overload protection | Protects against sustained overloads |
| Magnetic Protection | Short-circuit protection | Instantaneous trip for fault currents |
| Mounting | DIN rail (35mm) | Standard industrial mounting system |
| Width | 18mm | Compact design for space-constrained panels |
| Material | Copper contacts, Polyester housing | Durable construction for industrial use |
The D-curve characteristic is particularly noteworthy: it allows the breaker to withstand 10-20 times the rated current (320-640A) for brief periods without tripping, which is essential for motor starting applications. This makes the Delixi DZ47s 1P D 32A superior to standard C-curve breakers for industrial motor circuits.
Buying Considerations: MCB Selection Guide
When selecting a miniature circuit breaker like the Delixi DZ47s, several critical factors must be considered to ensure proper protection and system compatibility:
1. Trip Curve Selection:
- Type D (10-20x rated current): Ideal for circuits with high inrush currents (motors, transformers, welding equipment)
- Type C (5-10x): Suitable for commercial/light industrial with moderate inrush
- Type B (3-5x): Best for residential/lighting circuits with low inrush
2. Current Rating Calculation:
Calculate the maximum expected load current and add 25% safety margin. For motor circuits, consider the full load current (FLC) rather than starting current.
3. Breaking Capacity:
The 6KA rating is suitable for most industrial applications. For facilities with higher fault currents, consider 10KA or higher rated breakers from our High Breaking Capacity MCB selection.
4. Voltage Compatibility:
Ensure the breaker's voltage rating (230/400VAC) matches your system voltage. For three-phase applications, consider 3P Circuit Breakers.
5. Environmental Considerations:
Verify operating temperature range and consider additional protection like Surge Protection devices for complete system safety.
Frequently Asked Questions
Q1: What's the difference between D-curve and C-curve MCBs?
D-curve breakers (like the Delixi DZ47s D32A) are designed for circuits with high inrush currents, tripping at 10-20 times rated current. C-curve breakers trip at 5-10 times rated current and are better for general commercial applications. The D-curve prevents nuisance tripping during motor startup while still providing overload protection.
Q2: Can I use this 32A MCB for a 25A motor circuit?
Yes, the 32A rating provides a safety margin for a 25A motor circuit. The D-curve characteristic is particularly beneficial for motors, as it allows for the high starting current (typically 6-8 times running current) without tripping. Always verify that the cable sizing and other protection devices are appropriately rated for the circuit.
Q3: What does the 6KA breaking capacity mean?
The 6KA (6000 Ampere) breaking capacity indicates the maximum short-circuit current the breaker can safely interrupt without damage. This rating must exceed the maximum possible fault current at the installation point. For most industrial applications, 6KA is sufficient, but facilities with large transformers or generators may require higher ratings available in our High Breaking Capacity category.