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Control power transformers are designed with low impedance windings for voltage regulation, and can accommodate the high inrush current associated with contactors, starters, solenoids, and relays.
The Type T units are designed for the global market and are the best choice when size and cost are of concern. This is our most popular and complete offering of industrial control transformers. The following features are included:
Schneider Electric manufactures a wide variety of voltage combinations for control transformers. The voltage combinations are expressed as “Voltage Codes”, and are embedded within the catalog number of the transformer. Square D stocks at their two distribution Centers the most popular voltages to obtain 120V or 24V, covering the standard control circuit requirements.
Factory installed fuse blocks are pre-wired and mounted on top of the transformer, the Type TF and EOF transformers have the same footprint as the Type T and Type EO units, respectively. This design frees up space normally used for separate fuse blocks.
Type T and TF
UL E61239, Guide XPTQ2; cUL E61239; CSA LR37055, Guide 184-N-90
UL E61239, CSA LR37055 Guide 184-N-90
Transformers that are dual rated for 50/60 Hz are truly global units and no derating is required for voltages or VA. (Type T are 50/60 Hz; Type EO are 60 Hz with de-rating for 50 Hz).
(Difference in VA ratings between standards - IEC and UL)
The development of welded cores has allowed the incorporation of base plates on larger VA transformers. Base plates are usually welded to the core of the transformer for a solid connection tothe transformer. They allow manufacturers to offer more standardized mounting for specific VA sizes by allowing multiple core stacks. Available for Type T transformers only.
Being able to offer touch-safe terminals is increasing in importance. Currently all equipment that must comply with EN 60-204 (Machine and Low Voltage Directives) must have some type of barrier for live parts. Besides the CE standard listed above, domestic customers are requiring barriers on live parts with voltages above 460 V. These customers allow Plexiglas™ covers to be installed for these barriers. Type T transformers can be made Fingersafe® by using snap-on covers that are removable with a screwdriver or other flat tool. Covers are sold separately.
Comparing 9070 Control Transformer Fuse Block Accessory Kits