Dossena closed toroidal transducer is designed for exclusive use with DER4B series type B differential relays, ensuring accurate detection of differential/homopolar leakage currents to ground, it is the ideal solution for TT and TN electrical systems that require high reliability in differential protection, with the following characteristics:
Inner diameter: 35 mm
Rated current: 80 A
Maximum allowable current: 480 A
Use: Only with Dossena DER4B differential relay.
Transformation ratio: 500 (terminals 1-4)
Short-circuit current: 80 kA for 0.5 seconds
Degree of protection: IP20
Enclosure material: Self-extinguishing plastic CL V0
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TB35 takes advantage of a special nano-crystalline magnetic alloy core that ensures high sensitivity to differential currents to ground. This makes it perfect for installations where immediate and reliable identification of electrical faults is required, minimizing the risk of faults and outages.
Compatible exclusively with Dossena DER4B differential relays, the transducer must be installed upstream of the loads or lines to be protected. All active conductors (phase and neutral) must pass through the central hole of the toroid, which, thanks to its 35 mm internal diameter, allows easy passage even in complex installations.
Installation is facilitated by panel bottom or DIN rail mounting, with connections via standard 6.3 mm female fastons. Compact design and V0 material enclosure offer high strength and durability.
Each Dossena transducer is individually tested with an advanced computerized system that verifies its integrity and technical compliance. The self-extinguishing plastic housing, combined with short-circuit current tightness up to 80kA, ensures maximum protection even under the most critical conditions.
The Dossena transducer is suitable for use in industrial, residential and tertiary installations, particularly in TT and TN distribution systems, where protection from ground fault currents is critical. It can be used exclusively in conjunction with DER4B relays, ensuring maximum effectiveness in the detection and management of differential faults.
Use twisted and shielded cables between TB35 and DER4B
Connect the shield to ground at only one point
Avoid sharp cable bends near the transducer
The inner diameter of the toroid should be about twice as large as the set of through cables
Resistance of each connection less than 0.5
Minimize the distance between transducer and relay
| Inner diameter | 35 mm |
| Rated current | 80 A |
| Maximum allowable current | 480 A |
| Short-circuit current | 80 kA (0.5 s) |
| Transformation ratio | 500:1 |
| Mounting | DIN rail or panelboard bottom |
| Material | Self-extinguishing plastic V0 |
| Degree of protection | IP20 |
| Operating temperature | -10 ÷ +55 °C |
| Reference standard | IEC 61869-2 |
| Compatible networks | TT, TN |
| Compatibility | Only with Dossena DER4B |
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