Skip to main content
Log in
Siemens 5SY8208-8 — 2-Pole MCB (DIN Rail)

Siemens 5SY8208-8 SENTRON MCB, 2P D 8A, 40kA IEC

MPN5SY8208-8
Active

Siemens SENTRON 5SY8 series, miniature circuit breaker, 2-pole, D tripping characteristic, 8 A rated current, 400 V AC, 40 kA breaking capacity per IEC 60947-2, 5SY8208-8.

Siemens 5SY8208-8 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SY8208-8 — Identification
ParameterValue
Product designationMiniature circuit breaker
Brand nameSENTRON
Application environmentMechanical engineering / industry
5SY8208-8 — Electrical
ParameterValue
Number of poles2
5SY8208-8 — Protection
ParameterValue
Tripping characteristic classD
Overvoltage categoryIII
5SY8208-8 — Mechanical
ParameterValue
Width36 mm
Height90 mm
Depth76 mm
Installation depth70 mm
Mounting positionany
Protection degree (IP)IP20, with connected conductors

Product details

The Siemens 5SY8208-8 is a 2-pole miniature circuit breaker from the SENTRON 5SY8 series, with a D tripping characteristic and an 8 A rated current at 400 V AC. It's also rated 15 kA at DC per IEC 60947-2 for up to 72 V DC, and carries a 5 kA interrupting rating under UL 1077 and CSA C22.2 No. 235 — so it's accepted in North American control-panel applications where UL 508A compliance is required, not just IEC markets. The silicon-free and halogen-free construction makes it suitable for clean-room or sensitive electronics environments where outgassing contaminants are a concern.

Mounting and wiring in the panel

Terminal clamps accept solid or stranded copper from 0.75 mm² up to 35 mm², with a recommended tightening torque of 2.5 to 3.5 N·m. Combined terminals top and bottom mean you can feed through or loop out without separate busbar connectors.

Frequently asked questions

Where can I buy the 5SY8208-8 and get a price?

The 5SY8208-8 is sourced and quoted to order through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time, not a published stock figure.

What does the D tripping characteristic mean for this 8 A breaker?

The D curve trips magnetically at 10 to 20 times rated current (80 to 160 A for this 8 A unit), so it handles high inrush from motors, transformers, or welding gear without nuisance tripping on startup. Thermal overload protection still kicks in on sustained overcurrents above 8 A.

What is the breaking capacity of the 5SY8208-8 at 400 V AC?

40 kA at 400 V AC per IEC 60947-2. It also carries 15 kA at DC up to 72 V per IEC 60947-2, and 5 kA under UL 1077 / CSA C22.2 No. 235 for North American control-panel use.

What wire sizes does the 5SY8208-8 accept?

Solid or stranded copper from 0.75 mm² up to 35 mm². Torque the terminals to 2.5–3.5 N·m. Combined top and bottom terminals let you feed through without extra busbars.

What compliance documentation is available for the 5SY8208-8?

The breaker is rated per IEC 60947-2, UL 1077, and CSA C22.2 No. 235. It is silicon-free and halogen-free. Standard Siemens SENTRON declarations (CE, UKCA, RoHS, REACH) apply — consult the product documentation for specific certificate numbers.

MPN
5SY8208-8