What Size Is A 160a Mccb

What Is a 160A MCCB?

A 160 A MCCB (Moulded Case Circuit Breaker) is a protective device designed to handle continuous currents up to 160 amps. It sits in low-voltage distribution systems and acts to protect circuits from overloads, short-circuits and fault conditions. In your system, the 160 A rating means it can manage the sustained current of up to 160 amps under normal conditions, while the internal trip mechanism intervenes when abnormal currents occur. In the context of NUOMAK’s product, you’re getting a breaker rated for AC 400 V and a short-circuit breaking capacity of 35 kA (Icu) for added safety.

Understanding MCCB Frame Sizes

Frame size refers to the maximum current capacity the breaker’s case (housing) and mechanism are designed to support. For example, the NUOMAK 160 A model uses a 250A frame size, meaning the housing and mechanical structure are sized as if for up to 250 A, though the trip unit is set for 160 A.
Using a larger frame size than the nominal current rating offers you flexibility: if in the future your load increases you may replace or retune the breaker without changing the panel layout. It also means the breaker has more robust mechanical structure and better heat dissipation potential which can improve performance and longevity.

Typical Dimensions of a 160A MCCB

While exact width/height/depth vary by manufacturer and series, here is what you can expect when sizing your panel for a 160 A MCCB:

• Width: approximately 75–105 mm
• Height: approximately 130–165 mm
• Depth: approximately 60–85 mm
  These values are typical for breakers in this current class and allow for mounting in distribution boards without major space issues. For the NUOMAK product, however, exact external dimensions are not listed on the public product page, so you should obtain the drawing if tight space constraints apply.

Factors Affecting MCCB Size Selection

When you are choosing a 160 A MCCB (or any MCCB), you should look beyond just the current rating. Here are the critical factors:

1. Breaking Capacity (Icu/Ics).
This indicates the maximum short-circuit current the device can safely interrupt. In the NUOMAK 160 A model the Icu is 35 kA. You must ensure your system’s prospective fault current at the installation point is below this value (with margin). If not, you’ll need a breaker with a higher breaking capacity.

2. Frame Size & Future Flexibility.
A larger frame size gives you room for future upgrades and may offer better mechanical robustness. The 250 A frame on the 160 A model is an example of this.

3. System Voltage & Frequency.
Ensure the MCCB is rated for your system’s voltage (e.g., AC 400 V) and frequency (50/60 Hz). The NUOMAK model meets this.

4. Load Type & Application.
Are you protecting motors, transformers, or general distribution? Motor loads may require higher short-circuit interruption capability and coordination with upstream devices.

5. Panel Space & Ventilation.
Physical size, depth in the panel, and ventilation around the breaker affect heat dissipation and performance.

6. Selectivity & Coordination.
Check that the breaker will coordinate with upstream and downstream protective devices so you maintain selectivity during faults.

How to Choose the Right 160A MCCB for Your System

Here’s a step-by-step guide tailored for you (as a buyer, specifier or system integrator):

1. Calculate the load current – Add up all continuous loads, consider future expansion, and pick a breaker that supports your current with margin.
2. Check your fault level – Determine the maximum prospective short-circuit current where the breaker will be mounted. Ensure the breaker’s Icu ≥ that value.
3. Match frame size & panel layout – Make sure the breaker housing fits your panel and leaves room for wiring and ventilation.
4. Ensure selectivity – Choose a breaker whose trip curve allows coordination with upstream protection.
5. Review the product specification – For example the NUOMAK model: Rated Current 160 A; Frame 250 A; Icu 35 kA; 3 poles; AC 400 V system.
6. Consider future expansion – If you anticipate growth, selecting a breaker with higher breaking capacity or expandable trip unit may be wise.
7. Check service conditions – Ambient temperature, mounting orientation, enclosure type, and maintenance access all matter.

NUOMAK 160A MCCB Product Highlights

Here are key selling points of the NUOMAK 160 A model you should highlight to your clients:

• Rated Current: 160 A; Frame Size: 250 A for flexibility.
• Breaking Capacity (Icu): 35 kA at AC 400 V — robust enough for many commercial/industrial applications.
• 3-pole configuration, suitable for three-phase systems.
• Meets international standard IEC 60947-2 and national standard GB 14048.2.
• Construction uses flame-retardant materials, pure copper components, silver contacts and high-temperature arc chutes for high reliability.
• Wide application scope: industrial power distribution, commercial buildings, infrastructure, even residential systems.
• Lightweight (1.75 kg) and compact design, helping reduce panel weight and installation complexity.

If you present these features to your target customers (who are buying for business/industrial use rather than personal home use), they’ll see value in reliability, flexibility and future-proofing that NUOMAK provides.

Conclusion

Choosing the right MCCB means matching both the current rating (160A in this case) and the breaking capacity to your system’s demands. With the NUOMAK 160 A MCCB, you’re getting a high-performance unit with a 250 A frame size and 35 kA breaking capacity, suitable for many commercial and industrial uses. For your systems that demand reliability and flexibility, NUOMAK is a smart choice. Contact us today to learn more about how NUOMAK MCCBs can streamline your setup, protect your equipment, and give you confidence in your power distribution.

FAQs

What is the frame size of a 160A MCCB?
For the NUOMAK 160 A MCCB, the frame size is specified as 250 A.

Can I replace a 125A MCCB with a 160A one?
Yes — provided your wiring, bus bars, and downstream equipment are rated appropriately, and the new breaker’s trip characteristics coordinate with upstream protection. Always check system compatibility before making the change.

What cable size is suitable for a 160A MCCB?
Cable size depends on ambient temperature, derating factors and installation method, but typically for a 160 A load you might use copper conductors sized roughly 70–95 mm² (or larger depending on conditions). Specific local code and installation conditions must be followed.