Siemens 5SY4504-7 SENTRON Miniature Circuit Breaker

Overview

The Siemens 5SY4504-7 is a SENTRON 5SY4 series miniature circuit breaker (MCB) providing short-circuit and overload protection for low-voltage distribution circuits. Configured as a 1-pole+N, 4 A device with Type C tripping characteristic and 10 kA breaking capacity at 230/400 VAC, the 5SY4504-7 is designed for DIN-rail mounting in distribution boards, control cabinets, and auxiliary circuit protection panels where reliable, compact overcurrent protection is required.

Seven Star LLC supplies the genuine Siemens 5SY4504-7 SENTRON miniature circuit breaker to electrical contractors, panel builders, and facilities teams across Oman and the GCC. As a partner sourcing authentic Siemens low-voltage protection devices, Seven Star supports customers in Muscat, Sohar, and Salalah with genuine SENTRON MCBs for new distribution board builds, panel upgrades, and like-for-like replacement of aging circuit protection.

Measurement and Operating Principle

The Siemens 5SY4504-7 protects its circuit through two complementary tripping mechanisms. A thermal bimetal element responds to sustained overload current, bending in proportion to the heat generated by current flowing through it and tripping the breaker within a time that follows the standard IEC 60898-1 overload curve — slower for small overloads, faster as the overload increases. A separate electromagnetic trip element responds instantaneously to short-circuit-level currents, and with its Type C characteristic, the 5SY4504-7 trips magnetically between 5 and 10 times its 4 A rated current, matching the higher inrush currents typical of motor loads, transformers, and fluorescent or LED lighting circuits without nuisance tripping on start-up.

With a rated breaking capacity of 10 kA at 230 VAC (35 kA ultimate breaking capacity per IEC/EN 60947-2; 5 kA per UL 1077), the Siemens 5SY4504-7 is engineered to safely interrupt substantial short-circuit fault currents without internal damage, isolating the faulted circuit and protecting downstream wiring and equipment. The device carries CE, VDE, and UL 1077 approvals, confirming compliance with both IEC/EN 60898-1 and North American supplementary protector standards for broad applicability across mixed-standard industrial and commercial installations.

Engineering Design

Mechanically, the Siemens 5SY4504-7 uses Siemens’ compact SENTRON 5SY housing with a standard 70 mm module depth, snapping directly onto 35 mm DIN rail for fast panel assembly. Its 1-pole+N configuration switches the line conductor while providing a solid, non-switched neutral bus-bar connection, a configuration commonly specified for single-phase final circuits where local codes require neutral disconnection along with the phase conductor. Double terminal chambers accept two conductors of different cross-sections per terminal, simplifying loop-in wiring in densely populated distribution boards, and top or bottom infeed through identical terminals gives panel builders flexibility in busbar layout.

The breaker’s toggle mechanism includes trip-free operation, meaning the breaker cannot be held closed against a genuine fault by holding the operating handle, and a clear ON/OFF/TRIPPED indication on the handle position lets maintenance staff identify a tripped breaker at a glance during panel inspection. The touch-protected terminal design and latching slide with latch-down option add a further layer of safety during installation and servicing in live or energized panels.

Siemens 5SY4504-7 Key Features

• SENTRON 5SY4 series miniature circuit breaker, 1-pole+N, 4 A rated current
• Type C tripping characteristic, magnetic trip at 5–10x rated current
• 10 kA breaking capacity at 230/400 VAC (35 kA ultimate breaking capacity per IEC/EN 60947-2; 5 kA per UL 1077)
• Compact 70 mm module depth, snaps directly onto 35 mm DIN rail
• Trip-free mechanism — cannot be held closed against a genuine fault
• Double terminal chambers for two conductors of different cross-sections
• Top or bottom infeed through identical terminals for flexible busbar layout
• CE, VDE, and UL 1077 approved per IEC/EN 60898-1

Industrial Applications

The Siemens 5SY4504-7 is specified for protecting auxiliary and control circuits in HVAC and ventilation systems, control cabinet power supplies, PLC and instrumentation feeder circuits, and general lighting and small power distribution boards where a compact, reliable 4 A Type C breaker is required. Its UL 1077 supplementary protector rating also makes it suitable for OEM equipment and skid packages destined for North American as well as IEC-standard markets.

Seven Star LLC supports electrical contractors, panel builders, and industrial facilities across Oman — including Muscat, Sohar, and Salalah — with genuine Siemens SENTRON 5SY4504-7 circuit breakers for distribution board construction, control panel upgrades, and maintenance stock for ongoing plant electrical reliability programs.

Siemens 5SY4504-7 Technical Specifications

Electrical and Mechanical Data

Beyond its headline ratings, the Siemens 5SY4504-7 carries the full set of electrical data that panel designers need for thermal and coordination calculations. Power loss in the hot operating state is 1.3 W per pole at rated current, a figure that feeds directly into distribution board heat-rise calculations where dozens of breakers share a single enclosure under Omani ambient conditions. The device has a rated impulse withstand voltage (Uimp) of 4 kV, is rated for DC service up to 72 V, and its 1-pole+N construction occupies two modular widths on the DIN rail — approximately 36 mm — which is the dimension that determines how many circuits a given board can accommodate.

Terminals accept solid or stranded conductors from 0.75 mm² to 35 mm², and finely stranded conductors with end processing from 0.75 mm² to 25 mm², tightened to between 2.5 and 3.5 N·m. Two-conductor combinations in a single terminal chamber are limited to 0.75 mm² to 10 mm². Degree of protection is IP20 with conductors connected, rising to IP40 in the area of the operating handle when the breaker sits behind a distribution board cover. The permitted ambient range is −25 °C to +55 °C at up to 95 % relative humidity, and Siemens rates the mechanism at an average of 20,000 actuations under rated load. Net weight is approximately 321 g.

Selection and Coordination Notes

Specifiers choosing between tripping characteristics should note that the Type C curve of the 5SY4504-7 sits between Type B and Type D. A Type B device trips magnetically at 3 to 5 times rated current and suits resistive and long-cable circuits, while Type D covers 10 to 20 times rated current for transformer and high-inrush duty. At 4 A with a Type C curve, this breaker is aimed squarely at control-supply transformers, instrument power, small motor starters, and modern LED and electronic lighting loads whose capacitive inrush would nuisance-trip a Type B device of the same rating. Seven Star LLC can cross-reference an existing board schedule against the wider SENTRON 5SY4 range so that replacement devices retain the discrimination the original design intended.

Request a Quote

Contact Seven Star LLC for pricing, lead time, and availability on the genuine Siemens 5SY4504-7 SENTRON miniature circuit breaker in Oman. Our team can also help you select the correct current rating and trip characteristic for your circuit’s load profile.

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