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Protective device for signal equipment power supply circuits S24 type

 

Protective device for signal equipment power supply circuits S24 type

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This protective device (arrester) protects equipment from irregular voltage, such as lightning surges that may enter signal equipment power supply circuits and signal circuits.

【Dimensions】
S24-A type S24-B type W105×D60×H63.5
S24APJL type
S24APJ-E type
S24BPJ-E type
S24BPJL type
W60×D95×H70.5
 
 

●S24-A type

This protective device (lightning arrester) combines a high performance 3-electrode ceramic arrester combined with a high quality ZNR varistor and, though compact in size, is very sturdy and provides excellent surge protection and current withstand capacity.

The S24-A type protective device is for use with DC 24V power supply circuits and comprises a 3-electrode ceramic arrester 3Y20 (Arr), resistors and ZNR varistor. It provides excellent surge protection and a very large current withstand capacity.
Large energy lightning surges are absorbed by the discharge of Arr1, while low energy residual voltage on the lines is absorbed by Va1. The internal resistor of the S24-A type has a resistance of 10Ω, giving it a 50% improved voltage drop when compared with the older standard products.

 
S24-A type
 
 

●S24-B type

The S24-B type protective device is DC 24V circuit general use, where the condition is that the DC resistance on the line between the power supply and the protective device must be 10Ω or more (the old specification was 20Ω).
The S24-B type, similar to the S24-A type, comprises a 3-electrode ceramic arrester 3Y20 (Arr1) and a ZNR varistor (Va1). And, its protection performance is the same as the S24-A type. In particular, the combination of Arr1 and Va1 allows the S24-B type to fully demonstrate its protective capacity when it forms part of a directional relay protection circuit.
 
S24-B type
 
 
Main performance characteristics
 
Item Performance characteristics
S24-A S24APJL S24APJ-E
Use For DC circuits, power supplies
Nominal circuit voltage DC24V
Max. permissible circuit voltage DC35V
Impulse protection level 750V or less(10/200μs, 3kV applied)
Impulse discharge current (repeat) 10/200μs, 800A, 300 times at 3 min. intervals
Plug and Jack
Deterioration display
 
 
Item Performance characteristics
S24-B S24BPJL S24BPJ-E
Use For DC circuits, general use
Nominal circuit voltage DC24V power supply circuit resistance 10Ω or more
Max. permissible circuit voltage DC35V power supply circuit resistance 10Ω or more
Impulse protection level 750V or less(10/200μs, 3kV applied)
Impulse discharge current (repeat) 10/200μs, 800A, 300 times at 3 min. intervals
Plug and Jack
Deterioration display
 
 

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