schneider-electric
Schneider Sepam 40 Series Transformer/Feeder Protection Relay
Model: S40
4-hour response · Pricing in SAR · Delivery across all KSA regions
S40 — Schneider Sepam 40 Series Transformer/Feeder Protection Relay
The Schneider Electric Sepam 40 series is a comprehensive digital protection relay designed for medium-voltage transformer and feeder protection in distribution substations, providing a wide range of protection functions — overcurrent (ANSI 50/51), directional overcurrent (67), earth fault (50N/51N), voltage protection (27/59), frequency protection (81), and thermal overload (49) — in a single compact unit that replaces multiple electromechanical or analogue relay assemblies. The Sepam 40's built-in capacitive touch HMI provides local display of measured quantities, relay status, fault records, and protection settings without a laptop tool, enabling substation operators to read and modify protection settings during field rounds. The relay's protection logic is programmed through Schneider's SFT2841 software, which provides a Windows-based parameterisation environment with pre-configured application templates for common protection tasks — reducing engineering time for Saudi electrical engineers who may be managing protection settings across many substation panels.
The Sepam 40 records the last 10 fault events with time-stamped current, voltage, and status data, enabling post-fault analysis without a separate disturbance recorder. Its Modbus RTU and IEC 60870-5-103 communication ports integrate with SCADA and energy management systems as standard, with an optional IEC 61850 card available for utilities and industrial customers implementing digital substation architectures. The relay operates from 24–250 V DC auxiliary supply across the full ambient range of -25°C to +70°C, maintaining operation during Saudi Arabia's extreme summer temperatures in partially-shaded outdoor switchgear enclosures.
In Saudi Arabia, the Sepam 40 series is the most widely deployed Schneider protection relay in the Kingdom's medium-voltage distribution network, specified by SEC for 13.8 kV and 33 kV distribution substations across the power network expansion programme. ARAMCO specifies Sepam protection relays in its internal 13.8 kV distribution system at upstream production facilities, and SABIC's Jubail and Yanbu petrochemical complex electrical distribution uses Sepam 40 relays for feeder protection in the extensive 13.8 kV ring main distribution system serving process plant unit substations.
Razz Middle East supplies Sepam 40 relays with factory testing, SFT2841 parameterisation services, and site commissioning across Saudi Arabia. Our protection engineers provide application engineering, relay co-ordination studies, and relay settings calculations for new and retrofit protection projects at SEC-approved substations, ARAMCO facilities, and industrial plant electrical systems throughout the Kingdom.
Technical Specifications
Full specifications for the S40
- Protection Functions
- ANSI 50/51, 50N/51N, 27, 59, 81, 49, 67
- Fault Records
- Last 10 events with time stamp
- Communication
- Modbus RTU, IEC 60870-5-103; optional IEC 61850
- Auxiliary Supply
- 24–250 V DC
- Ambient
- -25 to +70°C
- Display
- Capacitive touch HMI
- Parameterisation
- SFT2841 Windows software
- Standard
- IEC 60255
Key Features & Benefits
- Wide protection function library — ANSI 50/51, 50N/51N, 27/59, 81, 49, 67 — covers transformer, feeder, and bus protection in a single relay, replacing five or more electromechanical relay assemblies.
- Built-in capacitive touch HMI with local measurement and setting display enables substation operators to read protection parameters without laptop tools during field rounds in Saudi Arabia's remote substations.
- Last-10-fault event recorder with time-stamped current, voltage, and status data provides the equivalent of a disturbance recorder for post-fault analysis without additional instrumentation.
- Modbus RTU and IEC 60870-5-103 standard communication integrates Sepam 40 into SEC, ARAMCO, and SABIC SCADA systems without custom protocol drivers.
- Optional IEC 61850 communication card enables Sepam 40 integration into digital substation architectures with GOOSE tripping and MMS data reporting, future-proofing protection system investments.
- 24–250 V DC auxiliary supply range accommodates both battery-backed and rectifier-fed substation auxiliary systems, covering all Saudi Arabia's distribution substation auxiliary voltage configurations.
- -25°C to +70°C ambient range maintains relay operation during Saudi Arabia's summer heat in outdoor switchgear enclosures and during winter cold in the Kingdom's northern and highland regions.
Industrial Applications in Saudi Arabia
- SEC 13.8 kV and 33 kV distribution substation feeder and transformer protection across the Kingdom's SEC network expansion programme, where Sepam 40 is a preferred relay in SEC's approved product list.
- Saudi Aramco 13.8 kV internal distribution system feeder protection at upstream production facilities in the Eastern Province, where SAES-P-100 engineering standards reference Sepam relay series.
- SABIC Jubail and Yanbu 13.8 kV ring main distribution feeder protection at process plant unit substations, where coordinated Sepam 40 relays provide selective fault isolation.
- NEOM utility substation feeder and transformer protection within the smart grid distribution network, where IEC 61850 GOOSE communication enables fast bus protection schemes.
- Red Sea Project 11 kV/400 V substation protection at resort facility substations, where Sepam 40 provides transformer differential and feeder overcurrent protection with Modbus SCADA integration.
- Ma'aden mining electrical distribution substation protection at Wa'ad Al-Shamal phosphate and gold mine 33 kV distribution, where high fault levels require precise overcurrent coordination.
- SEC rural electrification overhead line feeder protection, where Sepam 40's directional overcurrent function provides selective tripping on meshed distribution network feeders in Saudi Arabia's interior regions.
Industrial Supplier in Saudi Arabia
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Frequently Asked Questions — S40
Common questions from buyers in Saudi Arabia and the GCC