schneider-electric
Schneider Electric Sepam Protection Relay
Model: S20
4-hour response · Pricing in SAR · Delivery across all KSA regions
S20 — Schneider Electric Sepam Protection Relay
The Schneider Electric Sepam is a family of numerical protection relays covering motor, transformer, generator, feeder, and busbar protection applications from the entry-level Sepam Series 20 through the advanced Sepam Series 80, designed as the core protection device for medium-voltage switchgear across industrial, utility, and infrastructure applications. The Sepam Series 20 (S20) provides basic overcurrent, earth fault, and motor protection functions for single MV circuit applications, while the Sepam Series 40 (S40) adds directional protection and more protection function slots for complex protection schemes, and the Sepam Series 80 (S80) delivers the full function set including differential protection, distance protection, and auto-reclosing for substation protection system design.
Sepam relays use numerical measurement technology based on direct digitisation of CT and VT secondary signals without intermediate analogue processing, achieving measurement accuracy of 0.5% for protection and metering functions simultaneously. Each Sepam unit provides an integrated front panel HMI showing real-time measured values, protection function status, and event records with timestamps, enabling local fault investigation without a laptop or communication system. The Modbus RTU and IEC 61850 communication options connect Sepam to DCS, SCADA, and substation automation systems, with pre-wired test plugs allowing relay testing without disturbing the primary CT/VT wiring.
In Saudi Arabia, the Sepam protection relay KSA is deeply embedded in the Kingdom's MV power infrastructure. SEC's 33 kV and 13.8 kV distribution network uses Sepam relays for feeder, bus, and transformer protection at primary and secondary substations across all regions. ARAMCO's 33 kV process plant substations, SABIC's Jubail petrochemical complex 33 kV system, and MARAFIQ's utility power distribution in Jubail Industrial City all specify Sepam for motor, transformer, and feeder protection. Saudi industrial switchgear manufacturers build Sepam into their MV switchgear panels as the standard protection relay.
Razz Middle East supplies Sepam S20, S40, and S80 relays for new MV switchgear projects and replacement at existing installations across Saudi Arabia, with full relay testing, setting coordination, and IEC 61850 configuration services.
Technical Specifications
Full specifications for the S20
- Series
- 20 (basic) / 40 (directional) / 80 (advanced)
- Measurement Accuracy
- 0.5%
- Protection Functions
- OC, EF, diff, directional, motor, transformer, distance
- Communication
- Modbus RTU + IEC 61850
- HMI
- Front panel display with real-time values
- Test Plugs
- Pre-wired CT/VT test facilities
- Ambient
- -25 to +55°C
- Standard
- IEC 60255
Key Features & Benefits
- Numerical direct-digitisation measurement achieves 0.5% accuracy for both protection and metering functions simultaneously, enabling Sepam to serve as the protection relay and revenue-quality current meter in the same unit.
- Integrated front panel HMI with real-time measured values and timestamped event records enables local fault investigation without laptop or communication system, reducing mean-time-to-diagnose after MV fault events.
- Pre-wired CT/VT test plug sockets allow relay testing and setting verification during commissioning and maintenance without disturbing primary circuit wiring, reducing outage duration for relay test programmes.
- IEC 61850 Edition 2 GOOSE communication enables high-speed bus protection schemes and relay-to-relay communication for complex substation protection architectures in industrial and utility substations.
- Motor protection variant (S20M/S40M) provides comprehensive motor starting supervision, thermal protection, negative phase sequence, and differential protection for large MV motor applications.
- Parameter setting software (SFT2841) enables relay settings to be prepared offline, verified by simulation, and downloaded via front panel USB, reducing field setting time and configuration errors during substation commissioning.
- Proven reliability in Saudi Arabia's harsh ambient temperature conditions across decades of installation at outdoor substations, process plant switch rooms, and coastal desalination facilities.
Industrial Applications in Saudi Arabia
- SEC 33 kV and 13.8 kV distribution network feeder, bus, and transformer protection at primary and secondary substations throughout Saudi Arabia, where Sepam is the SEC-specified protection relay standard.
- ARAMCO 33 kV process plant substation protection at Eastern Province and Jubail oil and gas facilities, where Sepam S40 directional earth fault protection satisfies ARAMCO electrical engineering standards.
- SABIC Jubail petrochemical complex MV motor and transformer protection at 33 kV and 13.8 kV levels, where Sepam S80 provides differential protection for critical process transformers.
- MARAFIQ utility power distribution system protection at Jubail Industrial City, where Sepam S40 feeder protection in distribution substations serves industrial city tenant facilities.
- Saudi industrial MV switchgear manufacturer panel assemblies for commercial, industrial, and infrastructure projects, where Sepam is the standard protection relay fitted in MV switchgear panels.
- NEOM medium-voltage distribution infrastructure protection relay specification for city distribution substations, where IEC 61850 GOOSE compatibility enables centralised protection coordination across NEOM's power network.
- Desalination plant 33 kV and 13.8 kV substation protection at SWCC facilities on Saudi Arabia's Red Sea and Arabian Gulf coasts, where Sepam transformer and motor protection covers critical production assets.
Industrial Supplier in Saudi Arabia
Get a Quote for the Schneider Electric Sepam Protection Relay
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Frequently Asked Questions — S20
Common questions from buyers in Saudi Arabia and the GCC