SEPAM 1000-S40

The Schneider Electric SEPAM 1000 S40, also cataloged as the SEPAM 40 digital protection relay, performs current and voltage protection, fault detection, measurement, event recording, and local indication in medium-voltage protection circuits.

Hardware Specifications

Parameter	Specification
Model	SEPAM 1000 S40
Brand	Schneider Electric
Series	SEPAM 40
Type	Digital protection relay
Dimensions	222 mm (H) x 176 mm (W) x 130 mm (D), base unit
Operating Temp	-25 deg C to +70 deg C
Auxiliary Power Supply	24-250 VDC or 110-240 VAC
Operating Frequency	50/60 Hz
Front Protection Rating	IP52
Current Protection	Overcurrent, long-time overcurrent, short-circuit
Voltage Protection	Overvoltage, undervoltage, zero-sequence voltage
Additional Protection	Ground fault and directional protection, configurable
Display	LCD
Status Indicators	9 customizable yellow LEDs and red internal-error LED
Configuration Software	SFT2841
Configuration Security	Password-protected settings
Interface Language	English, Traditional Chinese

Protection and Configuration Functions

The SEPAM 1000 S40 processes configured current and voltage protection functions for feeder, transformer, and motor protection circuits. Available functions include overcurrent, long-time overcurrent, short-circuit, overvoltage, undervoltage, zero-sequence voltage, ground fault, and directional protection.

CT and PT ratios, protection curves, control logic, and I/O test parameters can be configured through SFT2841. The local LCD provides access to measured values, alarms, and recorded trip information. Nine yellow LEDs can be assigned to specific status or trip indications, with replaceable identification labels.

The relay also provides event logging and trip recording for diagnostic review. The auxiliary supply accepts 24-250 VDC or 110-240 VAC, while the specified operating frequency is 50/60 Hz.

Frequently Asked Questions

Q: What software is used to configure the SEPAM 1000 S40?
A: Schneider Electric SFT2841 software is used for configuration, diagnostics, parameter adjustment, and event record access.

Q: What auxiliary power supplies are supported?
A: The supplied specifications identify 24-250 VDC and 110-240 VAC auxiliary power supply ranges.

Q: Can the relay provide both current and voltage protection?
A: Yes. The documented functions include overcurrent, long-time overcurrent, short-circuit, overvoltage, undervoltage, and zero-sequence voltage protection.

Field Installation Guidelines

• Mount the relay according to the applicable SEPAM panel and switchgear mounting arrangement.
• Verify the auxiliary supply type and voltage range before energization.
• Check CT and PT wiring against the protection scheme before applying operating power.
• Confirm CT/PT ratios and protection parameters through the configuration interface before placing the relay in service.
• Route measurement and control wiring separately from high-current power conductors where practical to reduce electrical interference.
• Maintain appropriate shielding and grounding practices for connected signal circuits according to the switchgear wiring design.
• Verify the front-panel IP52 condition after installation, including the mounting interface and enclosure arrangement.
• Test configured protection functions and I/O behavior using the applicable commissioning procedure before connecting the relay to an energized protection circuit.
• Record the final protection settings and verify alarm, trip, reset, and indication behavior during commissioning.

---