Single-Pole MCB — Compact, Reliable Overcurrent Protection for Homes & Businesses

STCMart presents the CNC YCB9 Single-Pole MCB (Model: YCB9) — a compact, high-performance miniature circuit breaker built for residential, commercial and light-industrial distribution boards. Designed to IEC/EN standards, the YCB9 delivers dependable overload and short-circuit protection, selectable B/C/D trip curves, high breaking capacity and clear ON/OFF indication — ideal when you need safe, compact protection for 230V AC circuits.

Protect sockets, lights and small branch circuits with a Single-Pole Miniature Circuit Breaker (MCB) — a compact, DIN-rail mounted protective device that combines thermal (overload) and magnetic (short-circuit) tripping in one module. Single-pole MCBs are the standard choice for 1-phase branch circuits in residential, commercial and light-industrial installations.

🔧 Key Features & Benefits

• Single-pole protection for 1-phase circuits (AC) or single-pole
• Rated voltage (Ue): 230V AC (typical for AC variants)
• Wide current range: from small loads (1 A, 2 A …) to heavy loads (up to 63 A in YCB9-80 variant)
• High breaking capacity: up to 6 kA for standard versions; select variants allow 10 kA
• Instantaneous trip characteristic options: B, C, D (for different load types)
• Insulation & impulse withstand: Ui 500 V, Uimp ~6 kV (1.2/50 µs)
• Mechanical & electrical life: thousands of operations (depend on variant)
• Compact & modular footprint: DIN-rail mounting (35 mm rail) and slim width
• Universal certification & standard compliance: IEC/EN 60898, IEC 60947-2, CE / CB / CCC in many models

✅ Why Choose YCB9 MCB for STCMart Customers?

• Performance & Safety: Offers both thermal (overload) and magnetic (short circuit) protection in one compact module.
• Versatile Load Support: Trip curves B, C, D allow safe selection per application (lighting, motor loads, capacitive/inductive).
• High Fault Handling: Breaks fault currents up to 6 kA (or higher in certain models) to protect wiring systems.
• Compact Design: Saves space in consumer units and panels—ideal for dense electrical installations.
• Modular & Scalable: You can pair with auxiliary units, accessories, or expand modules easily.

Single-Pole MCB — compact DIN-rail miniature circuit breaker with thermal & magnetic protection, available in B/C/D trip curves and 6kA/10kA breaking capacities. Perfect for residential and commercial branch circuits. Fast delivery in Bangladesh. Buy single-pole MCBs at STCMart.

❓ Frequently Asked Questions (FAQ)

Q1. What do the trip curves B, C, D mean and when to use them?

• B-curve: Trips between 3–5 × In. Best for pure resistive loads (lighting, heaters).
• C-curve: Trips between 5–10 × In. Suitable for general loads including small motors.
• D-curve: Trips between 10–20 × In. Ideal for inductive loads with high inrush (big motors, transformers).
  Always match the curve to your load profile.

Q2. Can YCB9 MCB be used on DC circuits (like solar PV)?
Yes — CNC offers DC versions (YCB9-DM) for photovoltaic systems. They have appropriate voltage ratings and DC breaking design.

Q3. What breaking capacity do I need for my installation?
Calculate the prospective short-circuit current at the point of installation. Then choose a breaker whose rated breaking capacity (Icn) is equal to or higher than that value. Most YCB9 models provide 6 kA; some support 10 kA.

Q4. Are there standard approvals and certifications?
Yes, YCB9 models typically comply with IEC/EN 60898 and IEC 60947-2 standards, and many variants carry CE, CB, and CCC certifications.

Q5. How to choose between YCB9-63, YCB9-80 or YCB9-125?
Choose based on your load’s maximum current and required margin.

• YCB9-63: for typical residential / smaller commercial loads.
• YCB9-80 / YCB9-80M: supports higher current (to 80 A) with similar features.
• YCB9-125: for heavy industrial loads, high-current branch circuits (up to 125 A)

Q6. What is the life expectancy (mechanical / electrical)?
For YCB9-125, typical values are ~10,000 mechanical operations and ~1,500 electrical operations under load. Variants like YCB9-80 may offer longer life cycles depending on design.