1606-XLS240E — 240W DIN Rail Power Supply with Selective Fuse Bridging, 24V DC / 10A

The 1606-XLS240E is a 240W regulated 24V DC DIN rail power supply with Selective Fuse Bridging (SFB), delivering up to 10A continuous output from a universal 100–240V AC input. It's the higher-current member of the XLS family covered by the same SFB principle — temporarily boosting output current well beyond the rated value when a fault occurs, just long enough to blow a properly-sized downstream fuse and cleanly isolate the faulted branch, rather than collapsing into an undefined low-voltage state that leaves all connected loads in limbo.

Specifications

Parameter	Value
Part Number	1606-XLS240E
Output Voltage	24V DC (adjustable 24–28V DC)
Output Current	10 A continuous
Output Power	240 W
Input Voltage	100–240V AC (85–264V AC wide range)
Selective Fuse Bridging	Yes — boosts output to clear downstream fuses on fault
Efficiency	≥ 89% at full load
Holdup Time	≥ 20 ms at 120V AC full load
NEC Class 2	Yes
Mounting	35 mm DIN rail
Operating Temperature	−25°C to 60°C (derate above 50°C)

Panel Design Notes at 10A

Mount vertically for rated output; horizontal mounting reduces maximum current due to lower convective cooling — derate by roughly 20% if horizontal mounting can't be avoided.
Trim output voltage to 25–26V to compensate for cable voltage drop on long branch runs, keeping field devices closer to their nominal 24V rating at the far end of the wiring.
Size each branch fuse for both the expected load current and the SFB boost-clearing requirement — undersized branch fuses trip on normal inrush; oversized ones may not clear within the boost window.
Above 50°C ambient, derate output current by roughly 2.5% per degree Celsius — verify panel thermal conditions support full 10A output if the installation runs warm.

FAQ

Q: Can the output voltage be trimmed below 24V if a lower voltage is needed?

The adjustment range is 24–28V DC, so trimming below 24V is not supported. For a fundamentally different output voltage, a different supply model rated for that voltage range is required.

Q: Is this supply suitable for powering a controller and its I/O on the same rail?

Yes, provided the combined current draw of the controller and all field I/O stays within the 10A rating with margin. Add up backplane and field power requirements for all connected devices before finalizing the design.

Q: How does SFB differ from a standard current-limiting power supply?

A standard current-limiting supply throttles output voltage when demand exceeds the rated current, often leaving downstream fuses unable to trip because available current stays below their threshold. SFB temporarily boosts current specifically to clear those fuses reliably, isolating the fault rather than leaving the whole rail in a degraded voltage state.

Q: Can two 1606-XLS240E units be paralleled for higher current or redundancy?

Yes, using the same approach as smaller XLS units — trim one supply's output slightly higher than the other so it carries primary load, with the second balancing in as demand increases or taking over if the first fails.

1606-XLS240E New Power Supply Module 24V 10A 240W 1606XLS240E