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Siemens 5SL1280-7MB — 2-Pole MCB (DIN Rail)

Siemens 5SL1280-7MB SENTRON MCB, 2P C-Curve 80A, 3kA

MPN5SL1280-7MB

Siemens SENTRON 5SL1280-7MB miniature circuit breaker, 2-pole, C-curve, 80 A, 3 kA breaking capacity per IEC 60947-2 at 230/400 V AC, 2 MW units.

Siemens 5SL1280-7MB datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SL1280-7MB — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Application environmentResidential buildings/infrastructure
5SL1280-7MB — Electrical
ParameterValue
Number of poles2
Supply voltage at AC rated value230 V
5SL1280-7MB — Protection
ParameterValue
Tripping characteristic classC
Overvoltage categoryIII
5SL1280-7MB — Mechanical
ParameterValue
Modular width units2
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Min.-40 °C
Max.75 °C
Protection degree (IP)IP20, with connected conductors
5SL1280-7MB — Environmental
ParameterValue
Pollution degree2
5SL1280-7MB — Specifications
ParameterValue
With single-phase operation at AC rated value253 V

Product details

Siemens SENTRON 5SL1280-7MB — 2-pole C-curve MCB, 80 A, 3 kA

The Siemens SENTRON 5SL1280-7MB is a 2-pole miniature circuit breaker with C-curve tripping characteristic, rated 80 A at 230/400 V AC.

The 3 kA breaking capacity (IEC 60947-2) is the maximum prospective fault current this MCB can safely interrupt at its rated voltage. In a panel with a transformer-fed bus that can deliver 6 kA or more, this breaker would need upstream current-limiting protection — it is not a main, it is a downstream branch device. The 80 A rating at 230/400 V AC means it carries continuous load up to 80 A per pole; at 80 A and 230 V single-phase, expect about 9 W power loss per pole in hot state, so ventilation in a dense DIN-rail enclosure matters. The 2-pole design (2 MW units, 36 mm wide) switches both phase and neutral in single-phase circuits, or two phases in a multi-phase installation.

Depth 76 mm, height 90 mm, width 36 mm (2 MW units). Mounting position any — no derating for horizontal or inverted orientation. Sealable with a lead seal for tamper-proof metering or critical circuits. Halogen-free and silicon-free construction for use in clean-room or corrosive-free environments.

Frequently asked questions

Where can I buy 5SL1280-7MB and how is it quoted?

The 5SL1280-7MB is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — no stock count or price is published here.

What is the closest functional alternative to 5SL1280-7MB — 5SL6220-7?

The 5SL6220-7 is a 2-pole C-curve MCB in the same SENTRON family, but it is rated 20 A with a 6 kA breaking capacity per both EN 60898 and IEC 60947-2, versus the 5SL1280-7MB's 80 A and 3 kA. The 5SL6220-7 also has a higher mechanical life (10 000 cycles vs 4 000) and lower power loss (2.2 W vs 9 W per pole). They share the same 76 mm depth, 90 mm height, and DIN-rail footprint, so a panel designed for the 5SL6220-7 will physically accept the 5SL1280-7MB without rewiring, but the ampacity and breaking capacity differ — do not substitute without verifying the branch circuit's load and fault cur

What compliance documentation does Siemens provide for 5SL1280-7MB?

The 5SL1280-7MB carries IEC 60947-2 ratings (3 kA breaking capacity) and is designed for overvoltage category III, pollution degree 2. It is halogen-free and silicon-free. For specific RoHS, REACH, UL, or other regional declarations, refer to the manufacturer's compliance documentation available via the product's datasheet or Siemens Industry Online Support.

MPN
5SL1280-7MB