Meaning of aR, gG/gL, and aM symbols on the surface of a fuse.

What do the symbols aR, gG/gL, and aM on the surface of a fuse mean?

These symbols represent the operating level of the fuse.

Fuses are classified according to their function. In this case, the first letter indicates the functional class, and the second letter indicates the object to be protected.

Letter 1

a Partial range protection (back-up fuse)

g Full-range protection (general-purpose fuse)

Letter 2

G Cable and conductor protection (general application)

M Switching appliance protection (protection of motor circuits)

R Semiconductor protection (for rectifier protection)

L Cable and conductor protection (according to DIN VDE)

In addition, DIAZED-fuses are marked with "slow-acting" and "fast-acting" symbols, which are specified in IEC/CEE/DIN VDE (DIN is the code for the German national standard, similar to the Chinese national standard which is preceded by the letters "GB"; VDE is the world's leading certification body (short for the "Association of Electrical Engineers of Germany") and they are able to issue their own safety standards, and they issue their own safety standards. VDE is the world's leading certification body, ("Association of German Electrical Engineers"), and they can issue their own safety standards, and the standards they issue are often adopted as national standards in Germany." VDE DIN" before the German standard means that the standard is a German national standard published by VDE. IEC is the International Electrotechnical Commission.

The "fast-acting" characteristic means that the fuse breaks faster than the operating class gL/gG under short-circuit conditions. DIAZED fuses for DC-railway power supply systems are of the "slow-acting" characteristic and are particularly suitable for breaking DC currents with high inductance.

The fast-acting and slow-acting characteristics of the fuses are also suitable for the protection of cables and conductors, full-range fuses (gL/gG, gR, fast-acting, slow-acting), which safely and reliably disconnect both overload currents and short-circuit currents. Local range fuses can only be used for short-circuit protection (aM, aR).

gL (DIN VDE)/gG (IEC) Full-range cable and conductor protection

aM (DIN VDE/IEC) Local range motor circuit protection

aR (DIN VDE/IEC) Localized semiconductor protection

gR (DIN VDE/IEC) Full range of semiconductor protection

Fast acting Full range of cable and conductor protection

Slow acting Full range of cable and conductor protection