Finder 66.82.8.400.4300 – 66 Series Power relays

Why Choose the Finder 66.82.8.400.4300 Power Relay?

The Finder 66.82.8.400.4300 is a specified variant of the Finder Series 66 industrial electromagnetic power relay, intended for high-current electrical switching in automation, machinery and power control equipment. Its ordering code indicates a 400 V AC coil designation, two normally open contacts (DPST-NO) and silver tin oxide (AgSnO2) contact material. This combination is relevant to industrial applications requiring coordinated switching of two electrical circuits.

The Finder Series 66 is engineered for demanding electrical loads, combining a robust electromechanical switching mechanism with reinforced insulation between the coil and contacts. The two normally open contact arrangement is designed to close both circuits when the coil is energised, while the silver tin oxide contact material is well suited to applications where electrical switching performance and resistance to contact wear are important.

The 66.82 configuration uses Faston 250 quick-connect terminals and a top-flange mounting arrangement, making it suitable for integration into industrial control panels and equipment assemblies. Important: the 400 V AC coil designation is not among the standard Series 66 AC coil voltages listed in the manufacturer's published range. The exact availability, coil characteristics and approval status of 66.82.8.400.4300 should therefore be confirmed with Finder before ordering or installation.

Key Advantages

• Industrial electromagnetic power relay for electrical load switching and automation control.
• 400 V AC coil designation identified by the supplied ordering code, subject to manufacturer confirmation.
• DPST-NO contact arrangement enables simultaneous switching of two normally open circuits.
• 30 A rated contact design associated with the standard Series 66 two-pole normally open configuration.
• Silver tin oxide (AgSnO2) contacts provide robust switching characteristics for demanding electrical loads.
• Reinforced insulation between the operating coil and switching contacts.
• 8 mm creepage and clearance distances in the standard Series 66 insulation design.
• Faston 250 quick-connect terminals support practical electrical connections.
• Top-flange mounting provides secure installation in electrical equipment and control enclosures.
• Two-pole switching allows coordinated control of separate circuits using one relay.
• Non-latching electromechanical operation returns the contacts to their normal positions when coil power is removed.

Key Features

• Finder Series 66 power relay family.
• Part number: 66.82.8.400.4300.
• 400 V AC nominal coil designation, requiring manufacturer confirmation for this specific variant.
• AC-operated electromagnetic relay design.
• DPST-NO (2 Form A) contact configuration.
• Two normally open power contacts.
• 30 A standard Series 66 contact rating for the two-pole normally open configuration.
• 250 V AC nominal switching voltage in the standard Series 66 contact specification.
• 440 V AC maximum switching voltage in the standard Series 66 contact specification.
• 7,500 VA AC1 switching capacity for the standard 30 A contact configuration.
• Silver tin oxide (AgSnO2) contact material.
• Reinforced coil-to-contact insulation.
• 6 kV coil-to-contact impulse withstand capability in the Series 66 design.
• 4,000 V AC coil-to-contact dielectric strength in the Series 66 design.
• 8 mm creepage and clearance distances between coil and contacts.
• Faston 250 (6.3 × 0.8 mm) terminals.
• Top-flange / chassis mounting.
• RT II environmental protection in the standard Series 66 construction.

Two-Pole Power Switching for Industrial Control Systems

The Finder 66.82.8.400.4300 is identified by its ordering code as a two-pole normally open electromagnetic relay. In this type of relay, energising the operating coil causes the mechanical contact system to close both normally open contacts. Removing the coil supply allows the contacts to return to their open positions. This arrangement provides straightforward switching of two electrical circuits through a common control signal.

The DPST-NO configuration is particularly useful where two loads or conductors must be controlled together. The standard Series 66 two-pole normally open design provides a 30 A contact rating and 7,500 VA AC1 switching capacity, although the permissible load depends on switching duty, ambient conditions and the confirmed specification of the exact relay variant.

The silver tin oxide contacts are designed for robust electrical switching, while reinforced insulation helps separate the control circuit from the power contacts. These features support the use of Series 66 relays in industrial machinery, heating equipment, power control systems and other applications requiring dependable electromechanical switching.

The 66.82 flange-mounted housing and Faston 250 terminals enable direct wiring and secure mechanical installation. Because the supplied part number specifies a 400 V AC coil that is not listed in the standard published Series 66 AC coil range, the relay must not be selected solely on the basis of the ordering code; Finder should confirm the exact coil rating and operating requirements.

Typical Applications

• Industrial automation and machinery control equipment.
• Electrical power switching and distribution control systems.
• Two-pole load switching in industrial electrical circuits.
• Industrial heating systems, ovens and boiler control equipment.
• Heating, ventilation and air conditioning (HVAC) control systems.
• Electrical generators and standby power equipment.
• Industrial motor control circuits, subject to appropriate load ratings.
• Power management and electrical switching panels.
• Industrial process control and monitoring equipment.
• OEM machinery and specialised electrical equipment.