WAGO 281-637 3-Conductor Protective Earth Terminal Block, 4 mm², Green-Yellow

For installations where protective earth connection reliability is non-negotiable, the WAGO 281-637 stands apart with its 3-conductor PE terminal block design and tool-free CAGE CLAMP® technology. Unlike screw-type terminals that can loosen over time, this spring-pressure connection maintains constant contact force, ensuring a permanent, vibration-proof, and maintenance-free earth bond. Rated for 4 mm² conductors and built for DIN-rail 35 mounting, it is a compact yet robust solution for industrial, building, and panel applications.

Highlights

• 3-conductor protective earth (PE) terminal block with one common potential
• CAGE CLAMP® connection: fast, tool-free wiring for solid, stranded, and fine-stranded conductors
• Accepts 0.25–4 mm² (AWG 22–12) conductors, stripped length 10–12 mm
• Green-yellow housing for clear identification of PE function
• DIN-rail 35 mounting for quick snap-on installation
• Wide operating temperature range: -35 °C to +105 °C

In daily use

Electricians and panel builders will appreciate the front-entry wiring and compact footprint of the 281-637. Simply strip the conductor, insert it into the clamp, and the connection is secure—no torque wrench needed. The terminal block is made of polyamide 66 (PA 66), offering high mechanical strength and resistance to harsh environments. Its pollution degree 3 rating means it can be used in industrial settings where conductive pollution may occur. The green-yellow colour instantly communicates its protective earth function, reducing wiring errors.

Full specifications

• Brand: WAGO
• Model: 281-637
• MPN: 281-637
• EAN: 4045454084516
• Type: Protective conductor (PE) terminal block
• Number of conductors: 3
• Nominal cross section: 4 mm²
• Connection technology: CAGE CLAMP®
• Mounting type: DIN-rail 35
• Colour: Green-yellow
• Connectable conductor sizes: 0.25–4 mm² / AWG 22–12 (solid, stranded, fine-stranded)
• Stripped length: 10–12 mm
• Insulation material: Polyamide 66 (PA 66)
• Pollution degree: 3
• Wiring type: Front-entry
• Number of potentials: 1 (PE)
• Operating temperature: -35 °C to +105 °C
• Approvals: VDE, UL, CSA

Final note

With its tool-free CAGE CLAMP® and durable construction, the WAGO 281-637 delivers a secure and maintenance-free protective earth connection for any DIN-rail application.