Schneider Electric
Schneider Electric R9F321 Resi9 MCB 1P 6A–63A C-Curve 4.5kA | Miniature Circuit Breaker
Schneider Electric R9F321 Resi9 MCB 1P 6A–63A C-Curve 4.5kA | Miniature Circuit Breaker
Couldn't load pickup availability
The Schneider Electric R9F321 is a 1-pole, 6A–63A C-curve miniature circuit breaker from the Resi9 range with 4.5kA breaking capacity – the Schneider Electric residential MCB range made for apartments, villas and shops. It protects cables and equipment against overloads and short circuits in single-phase final circuits, and is installed on a standard DIN rail inside distribution boards and control panels.
Key features
- C-curve tripping characteristic suited to general loads such as lighting, sockets, air conditioners and small motors (trips at 5–10 × In)
- 1-pole design for single-phase final circuits
- Breaking capacity 4.5kA
- Positive contact indication – the handle shows the real contact position for safe isolation
- Fast clip-on mounting on 35 mm DIN rail and compatibility with standard comb busbars
- Compact width for neat, standardised distribution boards
Technical specifications
| Brand | Schneider Electric |
|---|---|
| Part number (SKU) | R9F321 |
| Product range | Resi9 |
| Device type | Miniature circuit breaker (MCB) |
| Number of poles | 1P |
| Rated current (In) | 6A–63A |
| Tripping curve | C curve |
| Breaking capacity | 4.5kA |
| Rated voltage | 230/240 V AC, 50/60 Hz |
| Mounting | 35 mm DIN rail, 18 mm per pole |
| Standards | IEC/EN 60898-1 |
Typical applications
- Apartment, villa and office distribution boards
- Commercial buildings, malls, hospitals and hotels
- Lighting, socket-outlet and air-conditioning circuits
- Control panels, pump panels and HVAC panels
- Replacement of old or faulty MCBs during maintenance
Selection guide
Match the rated current to the cable size of the circuit (for example 10 A for 1.5 mm² lighting, 16–20 A for 2.5 mm² sockets and 25–32 A for 4–6 mm² air-conditioner lines), choose the curve according to the load inrush, and make sure the breaking capacity is higher than the prospective short-circuit current at the board. For earth-leakage protection, combine the MCB with an Acti9 RCCB or use an RCBO.
Frequently asked questions
What is the R9F321 used for?
It is a 1P 6A–63A C-curve MCB used to protect single-phase final circuits against overload and short circuit in residential, commercial and industrial distribution boards.
Can the R9F321 protect against electric shock?
No. An MCB protects cables against overload and short circuit only. For protection against earth leakage and electric shock, add a 30 mA RCCB (residual current circuit breaker) upstream or use an RCBO.
What is the difference between the C curve and the B or D curves?
A C-curve breaker trips magnetically between 5 and 10 times its rated current and suits most general loads. B curve (3–5 × In) is for resistive loads and long cables, while D curve (10–20 × In) is for transformers and motors with high inrush current.
Buy Schneider R9F321 in Egypt
Spark Egypt is a trusted source for original Schneider Electric miniature circuit breaker (MCB)s such as the R9F321, serving contractors, OEMs, panel builders and plant-maintenance teams with tax invoices and fast delivery to Cairo, Giza, New Cairo, 6th of October, Sheikh Zayed, the New Administrative Capital, Alexandria, the Delta, the Canal cities and Upper Egypt. Contact our technical sales team to confirm selection, accessories and project pricing.
Share
