Technical data
Enclosure design	Switch cabinet
Output contacts	1 C/O contact
Time function(s)	Flasher relay
Time range	0,5 s - 100 s
Width	22,5 mm
Type	BC 7932N
Variant
Contact equipping	1 changeover contact delayed
Nominal voltage	AC/DC 24 V + AC 230 V
Pulse time	0,5 - 10 s
Variant	Start with impulse

The Dold flash relay BC7932N.81 is an industrial time relay for enclosure mounting, designed for controlling flashing functions in electrical systems. It features a dual-voltage design with rated voltage AC/DC 24 V and additionally AC 230 V, enabling flexible use in various voltage environments. The pulse time is adjustable between 0.5 and 10 seconds, with the total time function reaching up to 100 seconds. The time function starts with an impulse, which is necessary for applications where the output power must be activated immediately after actuation. The device complies with standard IEC/EN 61812-1 and is therefore suitable for use in industrial control systems and switchgear.

Flash relay with adjustable flashing frequency enables precise control of signals, e.g. for warning lights, indicator lights or in automation systems. The repeat accuracy is ≤ 0.5 % + 10 ms, ensuring high reliability during repeated switching operations. The output contacts consist of a changeover contact, designed for operation with a rated operating voltage of AC 250 V. The contact material AgNi (silver-nickel) ensures good switching performance and long service life. The electrical life is at least 150,000 switching cycles at 1 A and AC 230 V, while the mechanical life is 100 million switching cycles.

Technology explained clearly shows that the relay features an LED indicator which lights up when the output relay is activated (contacts 15–18 closed). This allows visual monitoring of the operating status. The terminal connections are designed as box terminals and allow connection of 1 x 4 mm² solid conductor, 1 x 2.5 mm² stranded wire with ferrule and plastic sleeve, or 2 x 1.5 mm² stranded wire with ferrule according to DIN 46228-1/-2/-3/-4. The wire stripping length is 10 mm, and the tightening torque for the positive-negative terminal screws M 3.5 is 0.8 Nm. Mounting is done via a DIN rail according to IEC/EN 60715, enabling quick installation in standard enclosures.

Compatibility and accessories includes use in enclosures with a width of 22.5 mm. The operating voltage can be supplied via terminals A3–A2 (AC/DC 24 V) and A1–A2 (AC 230 V). The drop-out voltage is 15 % of the rated voltage, ensuring safe deactivation even during voltage fluctuations. The permissible switching frequency is 36,000 switching cycles per hour, suitable for high operational loads. The maximum fuse rating is 4 A gG/gL to protect against short circuits.

Mounting and installation is performed by securing to a DIN rail inside the enclosure. The device dimensions are 22.5 mm (width) × 84 mm (height) × 97 mm (depth). The housing is made of thermoplastic with V0 flammability rating according to UL Subject 94, providing good flame resistance. The housing protection rating is IP 40, and the terminals are IP 20, suitable for use in enclosed enclosures. The operating temperature range is from -20 °C to +60 °C, and the storage temperature range is from -25 °C to +70 °C. The relative humidity is up to 95 % at 40 °C, and the operating altitude is limited to below 2000 m.

Advantages in operation include high repeat accuracy, long contact life, and easy mounting. The LED indicator enables quick diagnosis of the operating status. The dual-voltage design increases flexibility when integrating into existing systems. Compliance with standard IEC/EN 61812-1 ensures reliability and safety in industrial applications. EMC tests according to IEC/EN 61000-4-2 to -4-5 demonstrate high immunity to electromagnetic interference, which is crucial for reliability in industrial environments.