SURGE SUPPRESSORS

surge-suppressors

These compact and highly efficient low voltage/high energy surge suppressor combine in one unit the low clamping voltage and high surge current capabilities needed to protect solid state power and electronic systems from severe lightning-induced and other over-voltage surges.

We have a number of designed, tested and proven products to operate at determined surge conditions, or we can work with our customers to design a suppressor particular to specific application.

Surge Suppressors & Part Number List28V DC Surge Suppressors Technical Data Details115 VAC Surge Suppressors Technical Data Details

SURGE SUPPRESSORS AND PART NUMBER LIST

The Low Voltage/High Energy Surge Suppressors combine in one unit the low clamping voltage and high surge current capabilities needed to protect solid state power and electronic systems from severe lightning-induced and other over-voltage surges. This suppressor meets the need for low clamping voltage and exceptionally high surge current capability packaged in a single, small size unit. The suppressor is packaged to withstand rugged airborne and ground-based environments and will clamp repetitive high energy transients. It is designed for use in a wide variety of applications These Surge Suppressors protect both 28V DC and 115V AC Systems.

The Low Voltage/High Energy Surge Suppressors operation have been verified for single pulse capability and multiple pulse (multiple stroke) environments. This assures the suppressor will provide protection in the multiple stroke lightning environments for aluminum structures (6 x 70 μs wave-form), all composite structures (50 x 500 μs wave-form), and mixed structures (40 x 120 μs wave-form). The unipolar model is designed for DC power or signal circuits where the operating voltage is of only one polarity and surge voltages of the other polarity must be clamped to very low levels.

The Low Voltage/High Energy Surge Suppressors are especially suitable for clamping lightning-induced surges appearing on aircraft 28 volt DC power distribution busses feeding solid-state avionics. The suppressor clamps the high energy surges to levels easily tolerated by most solid state power supply inputs without interruption of power or tripping of circuit breakers. Its surge current capability exceeds that of many spark-gap devices, and its response “turn on” time is virtually instantaneous.

The suppressors meet applicable requirements of RTCA DO-160, US MIL_STD-704, and most other aircraft power quality specifications.

SURGE SUPPRESSORS

Part Number Name Description
LDS50-40-115 Surge Suppressor Suppressor 115V
LDS50-60-28-X Surge Suppressor Surge Suppressor Unipolar/Bipolar 28V
LDS50-73-28-X Surge Suppressor Surge Suppressor Unipolar/Bipolar 28V
LDS50-70-90 Surge Suppressor Spark Gap
Ground Clips
LDS10-07 Surge Suppressor Ground Clip
LDS10-09 Surge Suppressor Ground Clip
LDS10-10 Surge Suppressor Ground Clip

TECHNICAL DATA – LOW VOLTAGE SUPPRESSORS

VOLTAGE/CURRENT SPECIFICATIONS
LDS Model No: LDS50-60-281DC

Description:
The LDS50-60-28-1DC is a solid-state over-voltage suppressor
designed for application on 28 volt dc, aerospace power systems.

Specifications:
Operating Temperature:
-55 ˚c to 80˚c
Storage Temperature:
-55 ˚c to 125˚c
Operating Temperature:
28V(dc)
Maximum Continuous Operating Voltage:
36V(dc)
Maximum One-Second Over Voltage:
40V(dc)
Maximum Single Pulse Energy:
90J(40x120µS)
Clamp Voltage (typical):
@5mAdc current 40.0V(dc)

LDS50-60-28-1 Suppressor Voltage and Energy Curves Current Waveform 5A

5AGraph

Current (A) Voltage (V) Energy (J)
1062 46.2 5.75
2168 48.2 12.9
2998 49.9 18.5
4000 51.1 25.6
4967 53 32.9
6083 55.6 41.8
6939 57.5 49.6
8068 58.6 58.9
9074 60.5 68.6
9992 63.6 79.6
10998 66 90.4

Maximum Single Pulse* Currents
Pin Test Level*
WF 4 (6x70µS) (+) 12kA >>5
WF 5A (40x120µS) (+) 11kA >>5
WF 5B (50x500µS) (+) 2kA >5

Maximum Multiple Strok* Currents
(14 Pulses in 2s) Cable Bundle Test Level
WF 1 (6x70µS) (+) 9,000/4,500A1 >>5
WF 5A (40x120µS) (+) 7,500/3,750A1 >>5
WF 5B (50x500µS) (+) 2,500/1,250A1 >5

*Waveforms in accordance with SAE ARP5412 and RTCA/DO-16D Section 22 Change Notice 3

1First value is peak current of initial pulse, second is peak current of subsequent pulses

TYPICAL APPLICATION

AIRCRAFT

•28VDC power distribution busses

•Extended 28VDC power distribution circuits, at utilization equipment

•Externally mounted electrical apparatus (windshield and air date probe heater circuits, navigation lights, and electrical de-icing systems)

•DC power and control circuits within advanced composite airframe

GROUND

•28VDC power or signal circuits interconnected with long cables

•Alarm systems

•Low voltage lightning systems

•Remote or temporary installation exposed to severe transients

Assistance in Application Design is Available

28Vdata

Note: Lead lengths should be kept to a minimum in installations

TECHNICAL DATA – HIGH VOLTAGE SUPPRESSORS

VOLTAGE/CURRENT SPECIFICATIONS
LDS Model No: LDS50-40-115A

Description:
The LDS50-40-115AC is a metal oxide varistor (MOV) over-voltage suppressor designed for application on 115VAC 400Hz aerospace power systems.

Specifications:
Operating Temperature:
-55 ˚c to 80˚c
Storage Temperature:
-55 ˚c to 125˚c
Operating Temperature:
120V(dc)
Maximum Continuous Operating Voltage:
132V(dc)
Maximum One-Second Over Voltage:
400V(dc)
Maximum Single Pulse Energy:
357J(6x70µ)
Clamp Voltage (typical):
@10mA (peak) 400Hz 230V(peak)
@ 1kA (6x70µS) 425V(peak)
@ 5kA (6x70µS) 530V(peak)
@ 10kA (6x70µS) 650V(peak)

Maximum Single Pulse* Currents
Pin Test Level*
WF 1 (6x70µS) 10kA >>5
WF 5A (40x120µS) (+) 7kA >>5
WF 5B (50x500µS) (+) 1.8kA >5

Maximum Multiple Strok* Currents
(14 Pulses in 2s) Cable Bundle Test Level
WF 1 (6x70µS) (+) 6/3kA1 >5
WF 5A (40x120µS) (+) 74/2.16kA1 >5
WF 5B (50x500µS) (+) 1000A/505A1 >4

*Waveforms in accordance with SAE ARP5412 and RTCA/DO-16D Section 22 Change Notice 3

1First value is peak current of initial pulse, second is peak current of subsequent pulses

CurrentGraph

One current component D followed by 13 current componenent D/2 distributed
over a period of up to 15 seconds

TYPICAL APPLICATION

AIRCRAFT

•115 VAC power distribution busses

•Secondary power distribution circuits, at utilization equipment

•Externally mounted electrical apparatus (windshield and air date probe heater circuits, navigation lights, and electrical de-icing systems)

•AC power and control circuits within advanced composite airframe

GROUND

•115 VAC power or control circuits interconnected with long cables

•Alarm systems

•Solid state lightning systems

•Remote or temporary installation exposed to severe transients

Assistance in Application Design is Available


115Vdata