SDx Module
Introduction
One or two optional SDx modules can be installed on an earth-leakage circuit breaker (ELCB).
The SDx module has two outputs and provides alarms and fault differentiation.
The SDx module receives data from the trip unit through an optical link.
Description
 |
A Power supply B Output 2 (1NO+1NC) C Output 1 (1NO+1NC) D Lock knob E SDx module status
F Output 1 setting dial G Output 1 status LED
H Output 2 setting dial I Output 2 status LED
J Seal for setting cover K Clips to attach to ELCB |
SDx Module Characteristics
Power supply: 24–240 Vac/Vdc
Power:
-
2,000 VA maximum
-
240 W maximum
Output characteristics:
-
Voltage: 24–250 Vac/Vdc
-
Current: 2 mA–5 A maximum
Output Settings
The function assigned to each output of the SDx module is set by using a setting dial. Each output can be assigned with one of the following indications:
-
Overload trip indication (SDT): circuit breaker has tripped due to an overload fault.
-
Overload alarm (SDT105%): current is higher than 105% of the setting current (Ir).
-
Earth-leakage alarm (SDV80%): leakage current is higher than 80% of the earth-leakage trip threshold (IΔn).
-
Earth-leakage trip indication (SDV): circuit has tripped due to an earth-leakage current.
|
T |
SDT thermal fault indication |
|
|
T105% |
SDT thermal alarm: 105% Ir |
|
|
V80% |
SDV earth-leakage alarm: 80% IΔn |
|
|
V |
SDV earth-leakage fault indication |
SDT and SDT105% Operating Modes
Operating modes of the SDT output:
-
The output is activated when the circuit breaker trips due to an overload fault.
-
The output is reset when the circuit breaker is reset, closed, and energized.
Operating modes of the SDT105% output:
-
The output is activated when current is greater than 105% x Ir.
-
The output is reset in one of the following cases:
-
The current is lower than 105% x Ir.
-
After tripping, the circuit breaker is reset, closed, and energized.
-
|
I |
Charge current |
|
SDT105% |
Thermal alarm |
|
SDT |
Thermal fault indication |
|
Q |
Circuit breaker |
SDV and SDV80% Operating Modes
Operating modes of the SDV output:
-
The output is activated when the circuit breaker trips due to an earth-leakage fault.
-
The output is reset when the circuit breaker is reset, closed, and energized.
Operating modes of the SDV80% output:
-
The output is activated when the earth-leakage current is greater than 80% x IΔn for more than 5 seconds.
-
The output is reset in one of the following cases:
-
The current is lower than 80% x IΔn.
-
After tripping, the circuit breaker is reset, closed, and energized.
-
|
IΔn |
Earth-leakage current |
|
SDV80% |
Earth-leakage alarm |
|
SDV |
Earth-leakage fault indication |
|
Q |
Circuit breaker |