SCHNEIDER ELECTRIC STR 23 SE 1074050A

Schneider Electric STR 23 SE Trip Unit for Compact NS Breakers

Description

The STR 23 SE is an electronic trip unit from Schneider Electric’s Merlin Gerin line, designed to provide reliable overcurrent protection for Compact NS molded case circuit breakers. This unit offers adjustable settings for both overload (long-time) and short-circuit (short-time) protection, making it a versatile component for various industrial electrical distribution systems operating at up to 525V.

Specifications

• Manufacturer: Schneider Electric (Merlin Gerin)
• Model: STR 23 SE
• Part Number: 1074050A
• Type: Electronic Trip Unit
• Rated Voltage (U): Up to 525V
• Protection Functions: Overload (Long-time, Ir), Short-circuit (Short-time, Isd)
• Compatibility: Designed for Compact NS100, NS160, NS250 circuit breakers

Label Info

• Model: STR 23 SE
• Part Number: 1074050A
• Voltage: U <= 525V

Application

This trip unit is ideal for retrofitting, repairing, or maintaining existing installations that utilize the Schneider Electric Compact NS series of circuit breakers. It is commonly found in switchboards, motor control centers, and main distribution panels in commercial and industrial facilities.

Country of Origin

Made in France.

CO2 Impact

Opting for this pre-owned trip unit saves approximately 10 kg of CO2 compared to manufacturing a new one. This environmental saving is equivalent to the emissions from driving a car for 50 kilometers.

Availability

This is an obsolete item but is available from our stock. Ensure the longevity of your existing systems with this reliable spare part. Order now from spareparts2day for expert support and fast delivery.

FAQ

With which specific circuit breaker models is the STR 23 SE compatible?

The STR 23 SE trip unit is designed for use with the Schneider Electric (Merlin Gerin) Compact NS series of molded case circuit breakers, specifically models like the NS100, NS160, and NS250. It is not compatible with the newer Compact NSX series.

What do the dials ‘Ir’ and ‘Isd’ control?

These dials set the protection parameters. ‘Ir’ (Long-time protection) sets the overload threshold. ‘Isd’ (Short-time protection) sets the short-circuit trip threshold. This allows for precise coordination to protect equipment and cables without nuisance tripping.

Does this trip unit require an external power supply to operate?

No, the STR 23 SE is a self-powered electronic trip unit. It draws the necessary operating power directly from the current flowing through the main contacts of the circuit breaker, eliminating the need for an external control voltage source.

Friday, March 13, 2026

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