2-22 B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
SPECIFICATIONS CHAPTER 2: PRODUCT DESCRIPTION
2
Control: separate operate and reset inputs
Control mode: operate-dominant or reset-dominant
FORM-A VOLTAGE MONITOR
Applicable voltage: approx. 15 to 250 V DC
Trickle current: approx. 1 to 2.5 mA
FORM-A CURRENT MONITOR
Threshold current: approx. 80 to 100 mA
FORM-C AND CRITICAL FAILURE RELAY
Make and carry for 0.2 s: 30 A as per ANSI C37.90
Carry continuous: 8 A
Break (DC inductive, L/R = 40 ms):
Operate time: < 8 ms
Contact material: silver alloy
FAST FORM-C RELAY
Make and carry: 0.1 A max. (resistive load)
Minimum load impedance:
Operate time: < 0.6 ms
Internal Limiting Resistor: 100 Ω, 2 W
SOLID-STATE OUTPUT RELAY
Operate and release time: <100 µs
Maximum voltage: 265 V DC
Maximum leakage current in off state
(excluding voltage monitor circuit current): 100 µA
Maximum continuous current: 5 A at 45°C; 4 A at 65°C
Make and carry:
for 0.2 s: 30 A as per ANSI C37.90
for 0.03 s: 300 A
Voltage Current
24 V 1 A
48 V 0.5 A
125 V 0.3 A
250 V 0.2 A
Input voltage Impedance
2 W Resistor 1 W Resistor
250 V DC 20 KΩ 50 KΩ
120 V DC 5 KΩ 2 KΩ
48 V DC 2 KΩ 2 KΩ
24 V DC 2 KΩ 2 KΩ
Note: values for 24 V and 48 V are the same due to a
required 95% voltage drop across the load
impedance.
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