SEPAM 1000-S40 by Schneider | Medium-Voltage Protection Device

Schneider SEPAM 1000-S40 Digital Protection Relay

The Schneider SEPAM 1000-S40 is a reliable digital protection relay engineered for medium-voltage transformer applications. It delivers accurate monitoring, rapid fault detection, and flexible control functions in critical electrical distribution environments. Moreover, its microprocessor-based architecture ensures stable performance while supporting detailed event recording and remote supervision. The relay helps technicians improve transformer uptime, and it supports long-term operation across modern substations.

The device integrates seamlessly into Sepam 1000+ installations with configurable I/O, intuitive menus, and robust communication capabilities. Therefore, engineers can adjust protection parameters easily while maintaining consistent system reliability. In addition, the S40 relay supports advanced transformer protection features, making it a trusted choice for utilities and industrial distribution networks.

Technical Specifications

Protection Functions
• Overcurrent protection for phase and earth faults
• Thermal overload protection
• Restricted earth fault protection (optional)
• Transformer temperature monitoring via RTD/PT100
• Breaker control and monitoring
• Trip circuit supervision
• Event and disturbance recording

Electrical Ratings
• Nominal Current: 1 A or 5 A (selectable)
• Auxiliary Supply: 100–240 V AC/DC
• Frequency: 50/60 Hz
• Burden: <0.2 VA per input
• Accuracy: IEC Class 1

Inputs / Outputs
• Digital Inputs: 8 configurable
• Relay Outputs: 6 configurable outputs
• Analog Inputs: RTD/PT100 temperature sensors
• Communication: RS-485 Modbus, optional Ethernet

Display & Interface
• LCD display with navigation keys
• LED indicators for trip, alarm, and service
• Menu-driven configuration

Mechanical Characteristics
• Mounting: Panel or flush
• Dimensions: 144 × 144 × 200 mm
• Weight: 2.5 kg
• Protection Rating: IP52 front, IP30 rear

Environmental & Compliance
• Operating Temperature: −10 °C to +55 °C
• Storage Temperature: −40 °C to +85 °C
• Humidity: 5–95% non-condensing
• Standards: IEC 60255, IEC 61000, UL, CE
• Certifications: RoHS, REACh
• Lifecycle: Series discontinued, service available until 2030

FAQ

Q: Is the SEPAM 1000-S40 still in production?
A: No. The series is discontinued, but Schneider offers service support until 2030.

Q: What is the recommended replacement for long-term planning?
A: Schneider recommends the PowerLogic™ P5 series for new installations or upgrades.

Q: Can the relay communicate with SCADA systems?
A: Yes. It supports Modbus via RS-485 and optional Ethernet modules for remote monitoring.

Q: Does it support transformer temperature sensors?
A: Yes. It is compatible with RTD/PT100 sensors for monitoring winding temperature.

Q: Where is the SEPAM 1000-S40 typically used?
A: It is commonly installed in medium-voltage transformer bays within utility and industrial substations.