1. Fuses are classified according to their functions. At this time, the first character thumb represents the functional level, and the second letter represents the object to be protected.
1. The first letter
a Local range protection (backup protection fuse)
g Full range protection (-general purpose fuse)
2. The second letter
G cable and wire protection (-general application)
M switch electrical protection (protection of motor circuit)
R will protect the body (used as rectifier protection)
L cable and wire protection (according to DIN VDE regulations)
Two, 1, fuse aR (DIN VDE/IEC) partial range of semiconductor protection
2. Fuse gR (DIN VDE/IEC) full range of semiconductor protection
3. In addition, "slow motion" and "fast motion" are also marked on the fuse. This is stipulated in IEC/CEE/DIN VDE (DIN is a German standard code, similar to Chinese
The standard number will have the same word "GB" before the standard number; VDE is the world's authoritative certification body, (the abbreviation of "German Electrical Engineering Association") they can publish safety standards and they
The published standards are often adopted as German standards. "VDE DIN" placed before the German standard means that this standard is a German standard published by VDE. IEC is the International Electrotechnical Commission
(International Electrotechnical Commisson)).
1. "Fast action" feature means that the disconnection speed of the fuse under short-circuit conditions is faster than the operating level gL/gG. The fuse used in the DC railway power supply system is "slow action"
It is especially suitable for breaking DC currents with large inductance.
2. The fast action and slow motion characteristics of the fuse are also suitable for protecting cables and wires. The full range of fuse (g4/gG, gR, fast action, slow motion) can be safe and reliable
Disconnecting the overload current can also safely disconnect the short-circuit current. Local range fuses can only be used for short-circuit protection (aM, aR).
3. Brief introduction of letters:
gL (DIN VDE)/gG (EC) full range of cable and wire protection
aM (DIN VDE/IEC) partial range of motor circuit protection
aR (DIN VDE/IEC) Partial range of semiconductor protection
gR (DIN VDE/IEC) full range of semiconductor protection
