The 3210509 is a multi-level terminal block designed for easy and tool-free wiring using its push-in connection system. It accommodates a conductor cross-section range of 0.14 mm² to 4 mm² (AWG 26-12) and is rated for a nominal voltage of 500 V and a nominal current of 20 A. Its compact 5.2 mm width and front connection design enable wiring in confined spaces. Constructed from PA insulating material with a V0 flammability rating, this block includes an additional test connection alongside the double function shaft. It is tested for railway applications and is also suitable for machine building and plant engineering.