Demand Grows for Enhancements to Power Supplies

Smarter Power Prevents Downtime: Size, Noise and Stability Upgrades Enhance Power Supplies

Power supply enhancements include reduced component count, weight and size, more stringent EMI and stability requirements, or efficiency across the whole output power range and low standby consumption.

"Lately we see a growing demand for smarter industrial control components that benefit the bottom line," says Dan Armentrout, product manager for industrial components, Omron Electronics ( "Customers are beginning to realize real cost savings from components that prevent unplanned downtime or reduce troubleshooting."

Michelle Goeman, product manager—terminal blocks & electronic interface, Wago (, says her company receives requests for more compact, cost-effective supplies and also for advanced power supplies that provide reliable 24 Vdc power and reduce the number of components required, while providing improved stability and greater efficiency.

"Efficiency or low-power consumption calculations play a main role for control system designers when they're designing power backup systems and could determine overall wiring costs in a project," says Tobin Robertson, portfolio marketing manager for electronics, Weidmüller ( "We don't see or hear about someone wanting fewer components in a supply. That might indicate that a manufacturer is cutting corners and costing the customer with failures and replacements in the end."

"Reliability is foremost for our customers," says Herm Harrison, vice president, Foster Transformer ( "After all, if a piece of industrial equipment isn't running, it's not making its owner any money."

David Norton, vice president marketing, TDK-Lambda Americas (, says his company has received so many requests for efficiency across the whole output power range and low standby consumption that it will roll out new products in 2010.

RNB130 primary switched-mode power supply for field instruments includes a 1.2-in-wide housing and input 100-240 Vac nominal voltage with connection to mono-phased ac networks or to two-phase conductors of three-phase supply networks. Output is 24 Vdc, with 30 V maximum in the event of a fault. Power reserve includes a power boost of up to 2 A.
 Power Supplies N+1 REDUNDANCY
PS3500 power supplies have a modular design and selectable wiring configurations including N+1 redundant mode. These 24 Vdc, 15 A modules plug directly into a three- or six-position chassis/backplane for maximum capacity of 45 A or 90 A, respectively. The devices have external field connectors, LEDs and alarm outputs for quick diagnostic evaluation and natural convection cooling. They are certified for Class I, Div. 2/Zone 2 ATEX Zone 2 mounting.
With 20 A output at 12 Vdc, Quint SFB industrial-grade power supply includes selective fuse breaking (SFB) technology for supplemental branch circuit protection on the dc bus. On sensing a fault condition, the SFB technology delivers a short peak of current, up to six times nominal current, to the faulted load. It incorporates diagnostic feedback elements and offers early warning diagnostics through a local PowerBoost yellow LED and a PowerBoost dry contact.
Phoenix Contact
 Power Supplies OPEN AND SHORT
787 Series ECO power supply line offers provides open- and short-circuit protection and a constant current mode. Guarded by a DIN-rail-mount metal housing, all ECO power supplies carry two status indication LEDs—one indicating overloads and one indicating dc OK. It has accessory modules, including UPS and batteries, buffer modules, redundancy modules and electronic circuit breakers.
Pro-M Series power supplies have an extended temperature range of -25 °C to 70 °C, are available in six single-phase and four three-phase models with 24 Vdc output voltages and up to 40 A output currents. They have integrated overvoltage temperature protection, available diagnostic output, external shutdown ability, a power OK signal and remote on/off functions.
Series of ac-dc DIN-rail-mount power supplies with outputs rated 120-480 W operates off three-phase line input from 340–575 Vac. DPP120 series has 12 Vdc and 24 Vdc outputs, rated at 120 W, and DPP240 and DPP 480 power supplies have 24 Vdc and 48 Vdc outputs. These units include bi-phase operation and under a dropped-phase condition, they operate with the output power derated to 80%.
TDK-Lambda Americas
PSC75U Series single-output adapters, available in 48 and 56 Vdc, are compliant with mandatory energy-efficiency legislation. It meets Class B EMI standards and features overvoltage and short-circuit protection, as well as overcurrent protection with auto-restart, has no-load power draw of less than 0.5 W, and bears cUL/UL 609501, IEC60950-1, and CE safety markings and approvals.
Status information can be read at any time via a fieldbus connection on this dc power supply device. Operation close to the power limits can be detected by the central control system. Output voltage range covers 36-80 Vdc, and additional 24 Vdc output supplies other automation components with current requirements up to 2 A. This module is designed for continuous power output of 1 kW.
B&R Industrial Automation
PSG series is a general-purpose family of power supplies to cover the majority of 24 Vdc control applications. With an operating temperature range -20 °C to 75°C, PSG series includes eight DIN-rail-mounted power supplies with input and output ratings ranging 2.5-20 A. Class I, Div. 2, protection guards the PSG from sparking. It includes surge protection against transient and internal surges.
 Powe Supplies MORE RHINO
Rhino power supplies include NEC Class 2 plastic-housed low-profile switching supplies in 5, 12 and 24 Vdc adjustable output models. PSC series includes eight models with power ratings 12–90 W and features universal 85–264 Vac input voltage, adjustable dc output, and output current limitation. They are UL508-listed, UL1310-recognized for NEC Class 2 compliance and CE-marked.
Evolution three-phase power supply units in models 5–40 A with adjustable output voltages 22–24 Vdc have an extra-power function to supply up to 50% additional power for 4 sec. The power supply includes a wide nominal input voltage range from 3 x 360–520 Vac or 480–745 Vdc.
Sitop PSE200U electronic diagnostic module is available in 0.5-3 A and 3-10 A versions capable of monitoring four separate 24 Vdc load circuits. The modules recognize overload or short-circuit faults on 24 Vdc circuits and selectively deactivate the faulted path while maintaining supply power to remaining loads. With a range of 22-30 V, the module has adjustment potentiometers for each circuit with multi-color status LEDs for maintenance and individual load troubleshooting.
Siemens Industry
 Power Supplies 100 W AC/DC POWER
Top-100 Series ac/dc power supplies have a 2x4-in. industry-standard footprint, supply up to 100 W of output power using convection cooling over an operating range of –25 °C to 50 °C. Approved for Class I and Class II applications, these switchers include efficiency of greater than 90%, low-leakage current, over-voltage protection and compliance with EN 61000-3-2.
Power Sources
Bulletin 1609-U uninterruptible power supplies (UPS) in 750, 1000 and 1500 VA models are designed for protecting PCs, PLCs, servers and data networks with improved surge protection to reduce downtime of critical process applications.
 Switch Power Supply HIGHER VOLTAGES
WL9 low-profile switching power supplies are available in outputs to 135 Vdc with an output power rating of 720 W. Some have slot output voltage ranges ±1 Vdc from the nominal; others have adjustment ranges 0–5 Vdc to 0–135 Vdc. All models can provide constant voltage or constant current.
 Power Supplies SLIM IS IN
PS5R-SB 10 W and 15 W Slim Line power supplies range 10–240 W, available in 5 V/10 W and 12 V/15 W or 24 V/15 W. They are UL 508 listed, designed for hazardous locations and are NEC Class 2-rated.
Phaseo switch-mode power supplies are designed for 24 Vdc output of 0.3–40 A. In addition to 100–120 Vac input, the single-phase units can accept up to 200–500 Vac input.
Schneider Electric
 Converter Modules DC/DC CONVERTERS
TEP-100 isolated DC/DC converter modules are used where PCB mounting is not an option. It has a metal enclosure with four M3 inserts for attaching to a chassis or heat sink. Twelve models offer 100 W output with input ranges 18–36 Vdc or 36–75 Vdc and outputs 5–48 Vdc to 3–48 Vdc.
Traco Power
 diagnostic power conditioner POWER CONDITIONER
Diagnostic power conditioner (DPC) for Foundation fieldbus has an integrated diagnostics module that provides statistics to help diagnose problems associated with the fieldbus physical layer. It can aid in commissioning and maintenance of the fieldbus system.
 Switch Power Supply OUTPUT VARIETY
Primary-switched power supplies with pluggable screw, screw or spring terminals have 5 V, 12 V, 15 V, 24 V or 48 V outputs. Three units can be connected in parallel mode and some units have redundant modes. Integrated power factor correction (PFC) reduces harmonic currents. DIN-rail-mountable, these 240-960 A, three-phase power supplies have integrated input and overload protection, surge voltage and current protectors.
Trunkguard TPS400 Fieldbus power supplies have 350 mA for non-isolated, energy limited applications or 500 mA for high-current-demand applications of isolated, conditioned simplex, non-redundant, or duplex, redundant, power to up to four segments. It has a high-availability, modular design that is hot-swappable with load-sharing in redundant pairs, a metal housing, optional pluggable surge protection and multi-segment H1 connectors.
Moore Industries Int'l.
 Power Supplies 3-PHASE DIN-RAIL MOUNT
 CSG2400C three-phase input din-rail-mounted power supply provides 24 Vdc power. 12 in. wide, it provides 100 A continuous at 45 °C and a 150 A peak rating, short circuit, overload, over temperature, input/output overvoltage protection and is UL508-listed.
 Power Supplies UL508-LISTED
S8VS Series switching power supplies are UL508-listed and have a built-in display. The single-phase, single output ac-dc power supplies have displays on models ranging 60-480 W. It has overvoltage protection and an overload protection function allows the power supply to shutdown automatically if the outputs are shorted or if there is excessive current flow in the output. All models have a universal input 100-240 Vac.
Omron Electronics
SDN-C DIN-rail power supply in 20 A, single-phase 24 Vdc has visual diagnostic LEDs to show status at a glance and has active power factor correction, and comes equipped with standard screw terminal connections. Its metal case allows the unit to deliver full power in a wide temperature range from -25 °C to 60 °C.
 Power Supplies 40 A POWER SUPPLIES
Dimension QS40/QT40 is a series of 40 A, 24 Vdc DIN-rail switch-mode power supplies offered either in three-phase, 380-480 Vac or single-phase 208-240 Vac input. The input stage provides near-zero inrush and a low-input current when energized. Other features include active power factor correction, paralleling with load sharing, dc-OK contact, remote shutdown and a temperature range from –25 °C to 70 °C.
Puls Power Supplies
 Power Supplies 600 W SWITCHER
Mean Well HRP-600 Series of 600 W switching power supplies claim up to 89% efficiency. For no-load power consumption, an optional remote on/off control with 5 V/0.3 A standby output is available. The family consists of eight single-output models with wide adjustment ranges to cover voltages ranging 3.3–55.2 V. It has active PFC, 300 Vac input surge immunity for 5 sec, remote sense, dc OK signal, LED indicator, EMS immunity,  short-circuit/overload/over-voltage/over-temperature protection and internal fan.
 Power Supplies

Quad Output DC power supply has two 0–30 V/0-5 A outputs with selectable constant voltage and current modes. Two auxillary outputs with fixed current of 3-6.5 V/3 A and 8-15 V/1 A are provided. It has short circuit protection, a power cord and four pairs of test leads.