Mini Circuit Breaker(MCB)
DZ47 Mini Circuit Breaker
The DZ47 Mini Circuit Breaker is a compact, reliable MCB designed for AC 50/60Hz circuits with rated voltages up to...
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Guide
How to Read a Breaker Trip Curve
A Type C device is the default across most of this range. Knowing what the curve means stops nuisance tripping and undersized protection.
Two Mechanisms in One Device
A thermal magnetic breaker has a bimetallic strip that reacts slowly to sustained overload and an electromagnet that reacts within milliseconds to a short circuit. The trip curve is a chart of how long the device takes to open at a given multiple of its rated current.
What Type C Means
Type C is the characteristic used across our MCB, RCBO and smart breaker ranges. Its magnetic trip covers a band of higher current multiples than a Type B device, which is what allows it to ride through the inrush of motors, transformers and lighting banks without tripping.
When a Different Curve Helps
Where a load draws a heavy inrush a time adjustable device is useful. The time adjustable mini automatic circuit breaker in the range is available in C curve or D curve, which shifts that magnetic band further up.
Breaking Capacity Is Not the Curve
Breaking capacity is the fault current the device can interrupt safely, quoted separately as 4.5kA, 6kA or 10kA on different models in this range. The curve tells you when it trips, the breaking capacity tells you what it can survive.
Selecting for a Real Circuit
Match the rating to the cable, the curve to the load type and the breaking capacity to the prospective fault current at that point of the installation. Send a board schedule with an enquiry and we will quote model by model.
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MCB RCBO and AFDD What Each Device Actually Protects
Three DIN devices that look alike protect against three different faults. Getting the selection wrong leaves a real risk uncovered.
WiFi Zigbee or 4G Choosing a Smart Breaker Connection
The protection is the same. The difference between the three smart ranges is how the device reaches the person who wants to switch it.
Why a DC Circuit Needs a DC Rated Breaker
An AC breaker fitted to a solar string is one of the most common sourcing mistakes on the DC side and the reason the DZ47Z-63 series exists.
Specifying a Distribution Box for the Installation Site
Metal or plastic, indoor or outdoor, surface or flush. The enclosure decision is usually made last and causes the most site problems.
A Buyers Checklist for Sourcing Low Voltage Devices
What to ask a supplier before the first order, written from the questions we are actually asked.
FAQ
Related Questions
What curve do most of these devices use
Type C, which rides through the inrush of motors, transformers and lighting banks.
When should we ask for a D curve
Where a load draws a heavy inrush. The time adjustable device is available in C curve or D curve.
Is breaking capacity the same as the curve
No. The curve is when it trips, breaking capacity is the fault current it can interrupt safely.
What breaking capacities are available
4.5kA, 6kA and 10kA appear across different models in the range.
How do we pick a rating for a specific circuit
Match the rating to the cable, the curve to the load and the breaking capacity to the prospective fault current. Send the board schedule and we will quote it.
Have a Model List to Check
Send it over and we will confirm which devices in this guide apply to your circuits.