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058

Fuse Failure Indicator

S. Lenke

L1

L1'

F1

This circuit indicates when a device is functioning or when

its fuse has blown. It is a development of the Mains/Fuse

Failure Indicator published in Elektor Electronics

July/August 1995. It is smaller and cheaper than the previ-

ous design, even though it works on any mains supply volt-

age. A single bi-colour LED (D2) with separate anode con-

nections indicates operating (green) or fuse failure (red).

Resistor R1 limits the current through the LED to around

2 mA: the LED is thus reasonably bright. If higher bright-

ness is desired, the resistor value can be reduced.

The zener diode prevents the red and green LEDs from

lighting simultaneously in normal operation. With the fuse

intact, the LEDs are effectively in parallel, but the greater

voltage drop in the red LED’s arm of the circuit means that

only the green LED lights. General-purpose diodes D3 and

D4 prevent damage to the LEDs in the negative half-cycle of

the AC supply. If the circuit is used on a DC supply, the

D2

D3

D1

green

RL1

5V1

400mW

1N4007

red

*

R1

1W

5W

*

see text

D4

N

N'

1N4007

000157 - 11

diodes can be removed.

If the circuit is used to monitor the fuse on mains-oper-

ated equipment, it is vital to note that the components are

not isolated from the mains and the voltages present on

them can be lethal: do not touch!

(000157-1)

90

Elektor Electronics

7-8/2001

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