Page 697 - Din prodcuts 2020

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Command and signaling
Transformers selection table

Bell Safety Control Control and Safety Control and Isolating
transformers transformers transformers transformers transformers
for discontinuous use for general use for general use for general use for general use

6

Series TM TS TS-C TM-C TM-S TM-I
Reference standard IEC EN 61558-2-8 IEC EN 61558-2-8 IEC EN 61558-2-6 CEI EN 61558-2-2 CEI EN 61558-2-2 CEI EN 61558-2-2
CEI EN 61558-2-6 CEI EN 61558-2-4
Classification Fail safe Non-inherently short-circuit proof Non-inherently short-circuit proof Non-short-circuit proof control Non-short-circuit-proof control Non-short-circuit-proof control
transformer a and safety transformer a and isolating transformer a
Thermal protection integrated in secondary n n
Rated power 10, 15, 30, 40 VA 8, 16, 24 VA 10, 16, 25, 40, 63, 100 VA 50 to 2500 VA 50 to 2500 VA 50 to 2500 VA
Operation Discontinuous Discontinuous Continuous Continuous Continuous Continuous
Primary circuit voltage ratings 230 V a.c. 230 V a.c. 230 V a.c. 230/400 V a.c. 230/400V a.c. 230/400 V a.c.
Secondary Double insulation between primary and secondary windings n n n n n
circuit Full power on all outputs
characteristics n n n n
SELV secondary (no-load output voltage <50 V a.c.) n n n n
Dimensions 2 modules [10, 15 VA] 2 modules [8, 16 VA] 2 modules [10 VA] See overall dimensions 13/60 See overall dimensions 13/60 See overall dimensions 13/60
3 modules [30, 40 VA] 3 modules [24 VA] 3 modules [16 VA]
4 modules [25 VA, 40 VA]
5 modules [63 VA]
6 modules [100 VA]
 See page 6/58 for the choice of the protections.

Bell transformer TM, TS
Transformers for supplying extra low voltage, suitable for loads that require a discontinuous supply, in particular doorbells
and chimes. The primary and secondary circuits are perfectly isolated and separated.
Reference standard: IEC EN 61558-2-8

Control transformer TM-C, TM-S*, TM-I*

Transformer for supplying control circuits, for example commands, signaling, interlocks, etc.
Reference standard: CEI EN 61558-2-2

Safety transformer TS-C, TM-S*
Isolation transformer for supplying safety extra low voltage circuits (<50 V on no load). Accidental contact with the
secondary winding phases can be withstood without any danger.
Reference standard: CEI EN 61558-2-6

Isolating transformer TM-I*
Transformer in which the primary and secondary windings are electrically separated by a double or reinforced insulation, to
protect the circuit supplied by the secondary against hazards due to accidental simultaneous contact with earth and live
parts, or grounded parts that may become live in the event of an insulation fault.
Reference standard: CEI EN 61558-2-4
* TM-S and TM-I both comply to two standards.