Standard Requirements: dimensions conform to DIN22258 Part 3, mechanical performance is much higher than DIN22258 Part 3 Safety Number: 26*92 MCB140111 30*108 MCB140112 34*126 MCB140121 38*137 MCB140113 42*146 MCB140110 48*152 MCB140114 52*170 MCB220249 Usage Method: for use in vertical ring, can be used in combination with a class D circuit. Designed specifically for connecting a ring circuit to a compact circuit. Main characteristics: the use of high-quality alloy steel as raw material, and the independent development of stable heat treatment process, with very high mechanical properties and fatigue life, the surface using "environmentally friendly catalytic nickel phosphorus alloy technology", increases the surface hardness of the chain ring and wear resistance, more corrosion resistance, without changing the mechanical characteristics and dimensions of the product during infiltration and deposition, to form a new layer of alloy, can extend the service life and storage of the product under harsh conditions.