What does this device do in a control panel?
It is a 3-pole fuse carrier / fuse disconnector used to hold and isolate three 10 x 38 mm cylindrical fuses, allowing safe separation of the fused circuit for maintenance and fault-finding.
Which fuse size does it accept?
It is designed for 10 x 38 mm cylindrical fuse links.
Which fuse types can be used with it?
It is intended for gG and aM fuse types in 10 x 38 mm format (selection should match the application and protection requirements).
What are the rated current and voltage?
Rated operational current is 32 A (at 400 V AC), and rated operational voltage is up to 690 V AC and 690 V DC.
Is it suitable for DC applications as well as AC?
Yes. It is rated up to 690 V DC as well as 690 V AC, with utilisation categories specified for both AC and DC switching of the disconnector function.
What utilisation category does it have?
It is rated for AC-20B and DC-20B utilisation categories (in accordance with IEC 60947-3), which relate to switching of the disconnector under specified conditions.
How is it mounted?
It mounts on a 35 mm symmetrical DIN rail and is intended for vertical installation (tolerance approximately +/- 23 degrees).
What cable sizes can be connected to the terminals?
Screw clamp terminals accept: 1 x 1…16 mm² (rigid) or 2 x 1…6 mm² (rigid). The same ranges apply for flexible conductors with or without ferrules.
What tightening torque should be used for the terminals?
Recommended tightening torque is 2.2 N·m (typically using a PZ2 or 5.5 mm flat screwdriver).
Does it have a padlockable operating handle?
Yes. It uses a toggle control and is padlockable to help prevent unintentional operation during planned isolation procedures.
What is the short-circuit withstand rating?
Short-circuit withstand is specified as up to 120 kA (for example, at 400 V and also referenced at 500 V in IEC 60947-3 conditions). Actual performance depends on the fuse link and installation design.
What are the enclosure and environmental ratings?
The device is IP20 rated, pollution degree 3, and has a fire resistance rating of 960°C (IEC 60695-2-1). Operating and storage ambient air temperature is -40 to 70°C (with derating above 20°C), and operating altitude is 0 to 2000 m.
What are the approximate dimensions and weight?
Typical overall dimensions are approximately 79.5 mm (H) x 52.5 mm (W) x 61 mm (D), with a net weight around 0.126 kg.
Does this version include a blown-fuse indicator?
No, this version does not include local blown-fuse indication. If indication is required, a different variant would be needed; the DF103 itself is the standard non-indicating version.