siemens
Siemens SIRIUS 3UL23 Earth Leakage Protection Relay
Model: 3UL2230-1AA00
4-hour response · Pricing in SAR · Delivery across all KSA regions
3UL2230-1AA00 — Siemens SIRIUS 3UL23 Earth Leakage Protection Relay
The Siemens SIRIUS 3UL23 is a residual current monitoring relay for large industrial three-phase distribution systems where conventional residual current circuit breakers (RCCBs) cannot be used due to conductor size or system configuration. Connected via an external summation current transformer encircling all live conductors, the 3UL23 monitors the vector sum of the phase and neutral currents continuously and trips a shunt-release circuit breaker when the residual leakage current exceeds the adjustable setpoint — providing sensitive earth fault protection for industrial feeders up to several thousand amperes that cannot be protected by any direct-insertion RCD device.
The 3UL23 offers a sensitivity range of 0.03 A to 30 A in adjustable steps, covering both the sensitive nuisance-free detection levels (0.1–1 A) preferred for early-warning earth fault monitoring and the higher trip thresholds (5–30 A) appropriate for high-impedance grounded systems where a small continuous earth leakage is acceptable and only a major fault should trip. An adjustable time delay from 0 to 5 seconds enables co-ordination with upstream and downstream earth protection devices, preventing unselective tripping across multiple protection zones. Remote auxiliary contacts (1 trip + 1 alarm) enable SCADA integration for remote fault notification at unmanned Saudi substations and pump stations.
In Saudi Arabia, the SIRIUS 3UL23 KSA is installed in large industrial motor control centres and transformer LV protection panels where IEC 62020 earth leakage relay protection is required for solidly earthed TN-S systems serving wet process areas, chemical handling zones, and classified hydrocarbon areas at SABIC and Aramco facilities. Saudi OSHA regulations and SEC technical requirements mandate earth leakage protection on all circuits serving wet and classified areas, and the 3UL23 with its wide sensitivity range covers the complete spectrum of industrial earth fault protection requirements. Water treatment plant LV bus protection, where soil conditions create natural leakage current, benefits from the 3UL23's ability to distinguish normal leakage from genuine fault conditions.
Razz Middle East supplies 3UL23 relays with matched summation CTs, providing complete earth leakage protection packages with relay, CT, and wiring design for Saudi panel builders and MCC manufacturers.
Technical Specifications
Full specifications for the 3UL2230-1AA00
- Sensitivity
- 0.03–30 A adjustable (residual current)
- Supply
- 110–240 V AC
- External CT
- Summation type, 50A–4000A cable capacity
- Output
- 1 trip relay + 1 alarm relay
- Time Delay
- 0–5 s adjustable
- Reset
- Manual or automatic
- Mounting
- DIN rail
- Compliance
- IEC 62020, CE
Key Features & Benefits
- Sensitivity range 0.03–30 A in adjustable steps covers both sensitive early-warning earth monitoring (0.1–1 A) and higher-threshold protection (5–30 A) for high-impedance grounded systems in a single relay variant.
- External summation CT encircling all live conductors allows the 3UL23 to protect any cable or busbar size from 50 A to 4000 A — covering the full range of industrial feeder sizes without the limitations of built-in RCD sensors.
- Adjustable time delay 0–5 s enables selective earth fault co-ordination between upstream and downstream protection devices, preventing unselective tripping across multiple protection zones in large industrial distribution networks.
- Dual relay outputs (1 trip + 1 alarm) allow a two-tier response: low-level earth current triggers the alarm for investigation before a major fault trips the circuit, reducing unnecessary outages at Saudi continuous-process facilities.
- Automatic reset option allows the 3UL23 to reset automatically after transient earth leakage events (such as wet start-up of submersible pumps), reducing operator call-outs at remote NWC pumping stations.
- SCADA integration via auxiliary contacts enables remote earth fault notification at unmanned Saudi substations and pump stations, reducing field inspection requirements for facilities with 24/7 automated operation.
- IEC 62020 compliance satisfies the Saudi OSHA and SEC technical requirement for earth leakage monitoring on circuits serving wet process areas, chemical zones, and classified hydrocarbon areas at industrial facilities.
Industrial Applications in Saudi Arabia
- Large industrial MCC earth fault protection at SABIC Jubail petrochemical plants, where summation CTs on 800–2000 A MCC bus feeders detect insulation breakdown in wet process zones before personnel safety is compromised.
- Transformer LV bus earth leakage protection at industrial substations serving MARAFIQ utility customers, where the 3UL23 monitors the complete LV bus leakage current to detect distributed insulation degradation.
- Generator earth fault monitoring at SEC and Aramco facility backup generators, where the 3UL23 monitors the generator stator and connected LV cable insulation integrity during standby periods.
- Water treatment and pumping station LV protection at NWC municipal facilities, where natural soil-earth leakage from submersible pump cables is distinguished from genuine faults using the 3UL23's sensitivity adjustment.
- Classified area electrical installation earth fault monitoring at Aramco upstream facilities, where IEC 62020 earth leakage relay protection on feeder circuits to Zone 1 and Zone 2 areas satisfies the Ex installation requirements.
- Hospital electrical system earth fault monitoring, where the 3UL23 on operating theatre and ICU distribution feeders provides the supplementary earth protection required by NFPA 99 medical electrical safety standards.
- Large cooling tower and HVAC system earth protection at commercial buildings and industrial facilities, where insulation monitoring of motor feeders serving wet environments ensures personnel safety during maintenance access.
Industrial Supplier in Saudi Arabia
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