Power supplies

A power supply is an instrument that delivers regulated electrical power to laboratory equipment, controlling the voltage and current an instrument receives. The category spans units that protect equipment from voltage fluctuations as well as those that supply the precise current certain techniques require.

In a laboratory the term covers several distinct devices: bench units that feed regulated voltage to a circuit or instrument, electrophoresis supplies that drive a gel run, and uninterruptible systems that keep equipment running through a mains failure. The common thread is controlled, reliable delivery of electrical power to sensitive instrumentation.

A regulated power supply converts mains electricity into a stable output at a set voltage and current, holding that output steady despite fluctuations on the input. An uninterruptible power supply adds a battery reserve that carries connected equipment through an outage, while an electrophoresis supply holds a precise high voltage across a gel or capillary.

The catalogue covers uninterruptible power supplies (UPS), electrophoresis power supplies, general laboratory power supplies, surge protectors, broader power backup systems, and plain power supplies. These range from a single surge protector up to a high-capacity system sized for an instrument rack.

Uninterruptible supplies protect freezers, incubators and running instruments where a power loss means lost samples or a ruined experiment. Electrophoresis supplies drive protein and nucleic acid separation in molecular biology, genomics and proteomics, while a general bench supply feeds a circuit under test or a custom instrument.

First decide whether you need an electrophoresis unit or an uninterruptible supply, because they are specified differently. An electrophoresis unit is specified by its voltage and current ceiling, since the separation depends on the field it generates; a UPS is specified by the wattage it can carry and the runtime it holds that load.

Both are pre-owned, but a refurbished unit has typically been checked and brought back toward working condition, while a used unit is sold in its current state. For either, ask what has been verified; on a UPS that means battery condition, and on an electrophoresis supply it means output accuracy.

Prices in the catalogue range from EUR 1 to EUR 81.785, with an average near EUR 1.050. The low end covers surge protectors and small bench units, while the top of the range is occupied by high-capacity, rack-scale backup systems.

The names that appear most often are APC, Bio-Rad, Invitrogen, Powervar and Life Technologies. APC and Powervar sit on the UPS and power-conditioning side, while Bio-Rad, Invitrogen and Life Technologies appear on the electrophoresis supplies.

A warranty is often possible and is arranged in consultation for the specific listing. Because terms are set per listing rather than centrally, check what is offered on the unit you are considering.

Parts can be sourced via Questpair where a listing needs them. For a UPS the battery is the part most likely to need replacing, as cells age whether or not the unit has seen service.

A regulated bench or electrophoresis supply can run for many years provided its output stays accurate. The limiting part on a UPS is the battery, which ages over time, so a unit that tested fine a few years ago may hold only a fraction of its rated runtime now.

Used and refurbished supplies are listed at lower prices than new equivalents, and that price difference is the clearest reason to consider them. The affordable end of this catalogue is also the deepest, with new stock concentrated among the smaller, lower-cost units; weigh the specific listing and its arranged warranty against a new unit.

Questpair lists 1302 power supplies from 19 verified suppliers and distributors across 11 countries, in new, used and refurbished condition. You can compare listings directly within the catalogue.

Lead time and shipping depend on the individual listing and the supplier offering it, as units ship from verified suppliers and distributors across 11 countries. Check the specific listing for its availability, or contact Questpair, where specialists respond within 1 hour.

For an electrophoresis supply the output accuracy is what to verify, since a drifting voltage shows up as an inconsistent run rather than an obvious fault. For a UPS, treat the battery as a consumable that may need periodic replacement regardless of the unit's apparent condition.

The uninterruptible power supply is the most common type, used by labs protecting freezers, incubators and running instruments against outages. Electrophoresis supplies are reached for by researchers in molecular biology, genomics and proteomics running DNA, RNA or protein separations, while general bench supplies serve circuit testing and custom instruments.

APC and Powervar on the UPS side, and Bio-Rad, Invitrogen and Life Technologies on electrophoresis, are the names that recur. A well-represented brand means replacement parts are easier to source and one model can be compared against another without guesswork, and on the electrophoresis side it helps a unit pair cleanly with a known gel or cell-electrophoresis system.

The bottom of the band is surge protectors and small bench or UPS units, while the top is high-capacity backup systems sized for a rack or a room. The new-versus-used split also drives price, as used and refurbished units sit below new pricing, so comparing like with like matters more than comparing by brand alone.