siemens
Siemens 5ST3 Modular Load Break Switch
Model: 5ST3014
4-hour response · Pricing in SAR · Delivery across all KSA regions
5ST3014 — Siemens 5ST3 Modular Load Break Switch
The Siemens 5ST3 is a modular load break switch (LBS) for DIN rail distribution boards providing manual isolation and load switching of individual circuits rated up to 125 A at 400 V AC. Unlike MCBs which provide fault protection, the 5ST3 is a dedicated isolating and load-switching device used where a clearly visible, lockable OFF position is required for safe circuit isolation during maintenance — increasingly specified in Saudi Arabia's commercial and industrial distribution boards as facilities implement formal electrical safety management systems.
Available in 1-pole through 4-pole configurations from 25 A to 125 A, utilisation category AC-22A covers resistive and slightly inductive loads (heating, lighting), while AC-23A covers motor loads — allowing the 5ST3 as a per-circuit isolator for both general distribution and motor sub-distribution applications. The toggle-rotary handle provides clear ON/OFF indication visible from the panel front without opening the door, and optional padlock attachment allows LOTO procedures at the individual circuit level.
In Saudi Arabia, the 5ST3 LBS KSA is widely specified in commercial and industrial distribution boards where individual circuit isolation is required beyond the MCB protection function. Government building electrical designs in Riyadh increasingly specify load break switches on sub-distribution panels to satisfy Saudi Electricity Regulations (SER) requirements. Contractors building residential villa distribution boards select the 5ST3 for MEW-approved double-door enclosures requiring visible isolation points.
Razz Middle East stocks 5ST3 switches in all current ratings and pole configurations with same-week delivery and distribution board assembly services available.
Technical Specifications
Full specifications for the 5ST3014
- Rated Current
- 25–125 A
- Voltage
- 400 V AC
- Poles
- 1P, 2P, 3P, 4P
- Utilisation
- AC-22A (resistive), AC-23A (motor)
- Mounting
- DIN rail 35 mm, 2 modules per pole
- Handle
- Toggle-rotary, ON/OFF colour marking
- Padlock
- Optional in OFF position
- Short-Circuit
- 6 kA (with upstream MCB/fuse)
- Compliance
- IEC 60947-3, CE
Key Features & Benefits
- AC-23A motor load utilisation category allows switching of motor-circuit currents at rated current, making the 5ST3 suitable as a per-motor circuit isolator in sub-distribution panels feeding motor control circuits.
- Toggle-rotary handle with clear ON/OFF colour marking provides immediately visible isolation status from the panel front — a key requirement for Saudi MEW electrical inspection compliance.
- Optional padlock attachment in OFF allows LOTO procedures at individual circuit level, enabling multi-trade teams to apply personal locks on specific circuits without isolating the entire board.
- 1P through 4P configurations in a common module width cover every circuit requirement in Saudi distribution board designs, from single-phase lighting to three-phase motor sub-distribution.
- DIN rail 35 mm 2-module-per-pole format integrates into standard IEC 61439-3 enclosures alongside 5SY MCBs and 5SV RCCBs without special modifications.
- 6 kA short-circuit coordination with upstream MCBs and fuses ensures the 5ST3 withstands prospective fault currents at distribution board level in Saudi commercial and light industrial installations.
- Compact design and competitive pricing make the 5ST3 the default per-circuit isolator for Saudi panel builders assembling MDB and SDB boards for residential and commercial projects across the Kingdom.
Industrial Applications in Saudi Arabia
- Per-circuit isolation in commercial building sub-distribution boards across Saudi commercial towers and government buildings, where individual circuit isolation points satisfy Saudi Electrical Regulations (SER) maintenance requirements.
- Motor circuit isolation in sub-distribution panels feeding pump, fan, and conveyor starters, where AC-23A rating ensures reliable switching of motor circuits during industrial maintenance.
- Residential villa consumer unit main switch in MEW-approved enclosures, providing the visible isolation point required by Saudi building inspection authorities for each villa distribution board.
- HVAC equipment sub-distribution isolation for AHUs, FCUs, and chiller auxiliaries in commercial buildings, where padlock option supports HVAC maintenance safety procedures.
- Retail shop board circuit isolation at shopping centres in Riyadh, Jeddah, and Dammam, allowing maintenance of individual tenant circuits without disturbing adjacent tenants.
- Light industrial workshop per-machine circuit isolation, satisfying the IEC 60204-1 requirement for a local isolation means adjacent to each piece of production equipment.
- Panel builder component supply for domestic and export panels in Saudi MODON industrial zones, where the 5ST3's availability, competitive pricing, and brand recognition facilitate OEM machine panel cost optimisation.
Industrial Supplier in Saudi Arabia
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Frequently Asked Questions — 5ST3014
Common questions from buyers in Saudi Arabia and the GCC
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