1snk505320r0000 – zs4-s-bl [pk=50] switch terminal block

Why Choose the TE Connectivity ZS4-S-BL 1SNK505320R0000 Switch Terminal Block?

The TE Connectivity ZS4-S-BL 1SNK505320R0000 is a compact screw clamp disconnect terminal block designed for switching, isolation and test functions in industrial control panels and electrical distribution systems. Part of the ENTRELEC SNK series, this blue terminal combines reliable screw clamp conductor termination with an integrated blade disconnect mechanism for convenient circuit isolation.

The ZS4-S-BL provides two connection positions, one circuit and one level in a space-saving design with a terminal spacing of just 5.2 mm. Its disconnect blade enables a circuit to be opened without removing the connected conductors, making the terminal particularly useful for commissioning, troubleshooting, maintenance and measurement applications.

Rated at 25 A and 400 V to IEC specifications, the terminal accommodates flexible and rigid stranded conductors from 0.2–4 mm². Its robust polyamide housing, DIN rail mounting and wide operating temperature range make the ZS4-S-BL a practical solution for professional panel building and industrial automation installations. This product is supplied in a pack quantity of 50.

Key Advantages

• Integrated blade disconnect function enables convenient circuit isolation.
• 25 A IEC current rating for industrial control and distribution circuits.
• 400 V IEC voltage rating for versatile electrical applications.
• Accepts conductors up to 4 mm² with secure screw clamp termination.
• Compact 5.2 mm spacing helps maximise DIN rail wiring density.
• Blue housing provides clear identification within organised terminal assemblies.
• DIN rail mounting simplifies integration into control panels and machinery.
• Supplied in a convenient pack of 50 terminals for panel-building applications.

Key Features

• TE Connectivity ENTRELEC SNK series.
• ZS4-S-BL screw clamp disconnect terminal block.
• Blade-type disconnect mechanism.
• 25 A IEC current rating.
• 400 V IEC voltage rating.
• 2 positions, 1 circuit and 1 level.
• 0.2–4 mm² conductor capacity for single flexible conductors.
• 5.2 mm terminal spacing.
• Blue polyamide insulating housing.
• Compatible with TH35-7.5 and TH35-15 DIN rails.
• IP20 ingress protection.
• UL 94V-0 housing flammability rating.

Reliable Circuit Isolation for Industrial Control Systems

Disconnect terminal blocks allow electrical circuits to be opened at a clearly defined point without removing conductors from their terminals. The TE Connectivity ZS4-S-BL uses an integrated blade disconnect mechanism to provide convenient isolation for testing, commissioning, troubleshooting and maintenance while retaining secure screw clamp connections on both sides of the terminal.

The compact ENTRELEC SNK design is particularly suited to densely populated electrical panels. Its 5.2 mm spacing helps reduce required DIN rail space, while the polyamide housing, IP20 protection and broad operating temperature range support dependable use in industrial machinery, automation equipment and electrical distribution assemblies.

Typical Applications

• Industrial control panel disconnect circuits.
• Testing and measurement circuits.
• PLC and automation control wiring.
• Machine control cabinets.
• Electrical distribution and switchgear assemblies.
• Instrumentation and signal isolation circuits.
• Commissioning and maintenance test points.
• OEM machinery and industrial panel building.