Electromagnetic status indicators are ideal for applications which require great visibility in difficult light conditions and built-in memory which allows to display critical information after all power is gone. Typical applications include transient recorders, industrial process displays, portable field measuring equipment displays, contact status indicators and any binary on / off indicators.



Operating characteristics

Each disk contains a permanent magnet which interacts with an electromagnet. A current pulse activates a reversal of the magnetic field induced in the electromagnet which determines whether the segment is exposed (set) or retracted (reset). Indicators are available in many different styles and sizes, in a range of fluorescent colors including green, yellow, red and orange, in addition to white. For a complete listing refer to our color chart, available on request.


The light reflecting, rotating fluorescent disks in these indicators provide excellent visibility in most ambient light conditions.


The disks are the only moving parts and are rated at the minimum of 100 milion operations the indicators are extremely rugged and ideal for use in applications over a wide range of environmental conditions. Magnetic memory retains the indicators’ status through shock, vibration or power failure making them ideal for mobile applications.


Power is only required to change the data displayed. Inherent magnetic memory in each segment retains the display indefinitely without power being applied. Multiple displays can be operated on a few watts of total power.

Available types


 disk sizeCR / FPmodelND / NRexample
status indicator series 30:7,0mm++ / ++30+ / +C30NR
status indicator series 36: 8,9mm-- / --36- / +36NR
status indicator series 54: 13,0mm-- / - -54- / +54NR

C – cap, R – right angle pins, F – full angle pins, P – mount plate, ND – 3 pins, NR – 2 pins

Available colors

01 – white, 02 – orange, 03 – green, 05 – red, 06 – yellow. All other colors upon request.


Technical data

series: 303654
overal size: 11.5mm x 11.5mm
0.45" x 0.45"
10.2mm x 10.2mm
0.40" x 0.40"
15.2mm x 15.2mm
0.60" x 0.60"
disk size: 7mm
current pulse: 1,5ms 1,0ms1,0ms
min. amplitude: 250mA 350mA350mA
min. voltage: 4,5V 7,5V7,5V
max. voltage: 125V - -
coil resistance:
(at 20°C ambient)
12Ω ±10%18,2Ω ±10%18,2Ω ±10%
max. coil temperature: 95°C 95°C95°C
power to maintain displayed data: ZEROZEROZERO
temperature range: -40°C to 92°C
-40°F to 196°F
-40°C to 75°C
-40°F to 167°F
-40°C to 75°C
-40°F to 167°F
relative humidity: up to 95%
(provided no condensation occurs)
up to 95%
(provided no condensation occurs)
up to 95%
(provided no condensation occurs)
outdoor application: requires a weatherproof enclosure requires a weatherproof enclosure requires a weatherproof enclosure

Electrical characteristics

All indicators are current operated devices. Applied voltages must be sufficient to develop minimum specified current over full operating temperature range. Drive pulse duration requirements include current rise time. Coil drive requirements are specified at the module input terminals.






Status indicators


Product brochure:


Electromagnetic status indicators – general description
electromagnetic_status_indicators.pdf, 371KB