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Siemens 5SL1320-7MB — 3-Pole MCB (DIN Rail)

Siemens 5SL1320-7MB SENTRON MCB, 3P, 20A, C-Curve, 3kA

MPN5SL1320-7MB

Siemens SENTRON 5SL1320-7MB miniature circuit breaker, 3-pole, 20 A, C-curve, 3 kA breaking capacity per IEC 60947-2, 230/400 V AC, 3 modular width units, IP20.

Siemens 5SL1320-7MB datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL1320-7MB — Identification
ParameterValue
Brand nameSENTRON
Number of poles3
Pole configuration3P
Suitability for operationResidential buildings/infrastructure
5SL1320-7MB — Protection
ParameterValue
Tripping characteristic (curve)C
Breaking capacity per IEC 60947-23 kA
Overvoltage categoryIII
IP protection classIP20, with connected conductors
Pollution degree2
5SL1320-7MB — Electrical
ParameterValue
Rated voltage (AC, multi-phase)440 V
Voltage type (AC/DC)AC
Supply frequency range50/60 Hz
Power loss per pole at rated current (AC, hot)2.2 W
Mechanical service life (operating cycles, typ.)4 000
Rated voltage (AC, single-phase)253 V
5SL1320-7MB — Mechanical
ParameterValue
Modular width units3
Mounting positionany
Width54 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Terminal tightening torque, max.75 °C
Terminal tightening torque, min.-40 °C
SealableYes
5SL1320-7MB — Environmental
ParameterValue
Halogen-freeYes
Silicone-freeYes
Vibration resistance (IEC 60068-2-6)no

Product details

It breaks faults up to 3 kA per IEC 60947-2 at 230/400 V AC, 50/60 Hz — enough for most domestic and light commercial distribution boards where the available fault current stays under that threshold.

Fit and panel integration

Mounting position is unrestricted — horizontal, vertical, or flat — which helps when routing conductors in a crowded enclosure.

Electrical ratings in context

Rated for 230 V AC single-phase and 400 V AC three-phase (multi-phase operation up to 440 V AC max). In a residential board with a typical upstream transformer impedance, that's usually adequate; if your service entrance has a higher prospective short-circuit current, you'll need a higher-rated device (like the 10 kA rated 5SL4363-7). For a multi-breaker board, factor that into thermal derating if the ambient is near the 75 °C max. Mechanical life is 4,000 operating cycles typical — fine for a distribution board where the breaker sees infrequent switching. Not intended for daily load-switching duty; that's what a contactor or switch-disconnector is for.

Frequently asked questions

Where can I buy 5SL1320-7MB and what is the lead time?

We source the 5SL1320-7MB to order through independent distribution. Availability and current pricing are confirmed at quote time against an RFQ — submit a request and we'll provide a firm lead time and price.

What is the closest functional second-source to 5SL1320-7MB?

The Siemens 5SL4363-7 is the closest functional sibling — same 3-pole, C-curve, SENTRON platform, same 76 mm depth and 54 mm width. The key difference: 5SL4363-7 is rated 63 A with a 10 kA breaking capacity per IEC 60947-2, so it drops into the same panel footprint but handles higher current and fault levels. For a 20 A circuit, the 5SL1320-7MB is the correct rating; the 5SL4363-7 would be oversized and may not coordinate with downstream devices.

Will 5SL1320-7MB drop into a panel specified around 5SL4363-7 without rewiring?

Yes — both share the same 54 mm width (3 MW), 76 mm depth, 70 mm installation depth, and DIN-rail mounting. The footprint is identical. The swap is mechanical; you do need to verify that the 20 A rating and 3 kA breaking capacity match the circuit's requirements, because the 5SL4363-7 is a 63 A / 10 kA device.

What compliance documentation does Siemens provide for 5SL1320-7MB?

The 5SL1320-7MB carries the standard SENTRON compliance package: it is halogen-free and silicon-free, rated for overvoltage category III and pollution degree 2. Full RoHS and REACH declarations are available from Siemens on request. The product is designed to meet IEC 60898 and IEC 60947-2, though the listed breaking capacity is per IEC 60947-2.

MPN
5SL1320-7MB