Question 1

What is SFB Technology and why is it important?

Accepted Answer

SFB (Selective Fuse Breaking) Technology provides a static boost of up to 6 times the nominal output current for 15 milliseconds. This ensures that downstream miniature circuit breakers (MCBs) trip reliably even on long cable runs where voltage drop would normally prevent sufficient fault current. Without SFB, a standard power supply may not deliver enough current to trip a C-curve MCB at the end of a long 24VDC branch circuit, leaving the fault uncleared.

Question 2

How does the preventive function monitoring work?

Accepted Answer

The QUINT POWER continuously monitors its output and signals status through a DC OK relay contact and an analog output (0–10V). The relay activates when the output is within specification and de-energizes if the output drops below threshold, enabling PLC-based monitoring. The analog signal provides a proportional indication of output load percentage, allowing trending and predictive maintenance—warning operators when the power supply is approaching its capacity before a failure occurs.

Question 3

What is the advantage of NEC Class 2 output?

Accepted Answer

NEC Class 2 designation means the power supply's output is inherently power-limited to safe levels (typically under 100 VA at 24VDC). Per the National Electrical Code (NEC), Class 2 circuits do not require conduit, can use smaller wire gauges, and have relaxed spacing requirements. This simplifies installation and reduces material costs for the 24VDC distribution in the control panel. The QUINT POWER NEC Class 2 variants (up to 3.8A output) meet these requirements without external current limiters.

Question 4

How should I size the QUINT POWER supply for my control panel?

Accepted Answer

Calculate the total 24VDC current demand by summing all loads: PLC CPU and I/O modules, HMI panels, sensors, solenoid valves, relays, and other devices. Add a 20-30% reserve for future expansion and inrush currents. Select a QUINT POWER rating that meets this total at the maximum expected ambient temperature (derate above 60°C). For critical applications, consider a redundant configuration using two QUINT POWER units with an ORing diode module (QUINT ORING).

Parameter	Value
Output Voltage	24 VDC
Output Current Range	2.5–40 A
Input Voltage Range	100–240 VAC (85–264 VAC extended)
Efficiency	Up to 95.4 %
SFB Technology	6× In for 15 ms (static boost)
MTBF	> 500,000 hours
Connection Technology	Push-in (tool-free wiring)
Operating Temperature	-25 to +70 °C
Certifications	UL 508, UL 60950-1, NEC Class 2, ATEX, GL
Width (20A variant)	49 mm

Phoenix Contact QUINT POWER

Specifications

Key Features

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ABB CP-S 24/20.0-5 Power Supply

Applications

Frequently Asked Questions

References & Citations