Product Overview
Single-Phase Industrial Control and Isolating Transformer with Multi-Tap Primary
Condition
Used. Pulled from a lightly used working machine. Visual inspection only; function testing not performed. Markings legible: mdexx TAM3496-0ED70-0FA0, 100 VA / 310 VA, PRI 460V / 400V / 230V, SEC 24V / 4,2 A, ta 50°C / B 50...60 Hz, EN 61558 Ii0. Base stamped JTA1148 80. Screw terminal blocks and mounting hardware intact.
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Product Overview
Built for industrial control enclosures and automation cabinets, the mdexx TAM3496-0ED70-0FA0 isolating transformer steps down common plant supply voltages to safe 24 V AC control power. A multi-tap primary winding accepts 230 V, 400 V, or 460 V AC at 50/60 Hz to output 24 V AC at 4.2 A continuous. The 100 VA continuous rating includes a 310 VA short-time surge capacity to handle high-inrush loads from motor contactor coils, relays, and solenoids without secondary voltage collapse. The rugged laminated core features finger-safe screw-clamp terminals with integrated quick-connect tabs, paired with a dual-purpose base plate for panel bolting or direct 35 mm DIN rail mounting.
Key Features
- Continuous Power Rating: 100 VA with 310 VA short-time inrush capacity
- Multi-Tap Primary: 230 V (terminals 1-2), 400 V (terminals 1-3), 460 V (terminals 1-4) at 50/60 Hz
- Secondary Output: 24 V AC at 4.2 A continuous (terminals 31-32)
- Vector Group: Ii0 single-phase isolation
- Thermal Class: Class B insulation rated for ambient operating temperatures up to 50 °C
- Mounting Options: Slotted chassis mounting footplate with integrated snap-on DIN rail adapter
- Terminal Configuration: Screw-clamp terminals with 6.3 mm quick-connect male tabs
- Safety & Standards: EN 61558 compliant, CE marked, and cURus recognized
Applications
- Stepping down multi-tap line voltages inside industrial machinery cabinets to run 24 V AC contactors, pilot indicators, and control relays.
- Replacing failed Siemens or mdexx control transformers in European-spec machine tools without modifying panel mounting layouts.
- Powering 24 V AC solenoid valve banks, motor starters, and auxiliary control circuits in shop automation projects.
- Bench testing and powering low-voltage HVAC dampers, commercial building controls, or industrial prototyping setups.
Frequently Asked Questions
How are the primary voltage taps wired?
Line power connects across terminal 1 and the tap corresponding to the incoming voltage: terminal 2 for 230 V, terminal 3 for 400 V, or terminal 4 for 460 V. Secondary 24 V AC power is taken across terminals 31 and 32.
Are manuals or mounting screws included?
Not included.
What condition is this transformer in?
This unit was hand-pulled from decommissioned equipment and inspected visually, with screw terminals, winding tape, and core intact. Function testing was not performed. Photos are of the actual stock.
Few things in a control cabinet are more dependable than a solid iron-core transformer that does not care which plant voltage you hand it. Wire the correct tap, latch it to the rail, and get back to work.
