/// Plug-in fast trip industrial latching relay with 8 C/O contacts Rugged plug-in relays for extreme reliability, within long endurance applications and harsh environments Industrial latching fast trip relay, 8 pole Part of D-platform Latching (bistable) relay Magnetic arc blow-out for high breaking capacity Back EMF suppression diode on trip and reset inputs 8 C/O contacts Fast Tripping <10ms Contact position indicator Flat, square and silver plated relay pins for excellent socket connection Wide range sockets High DC breaking capacity Less than 0.2W power consumption after trip Optional positive mechanical keying relay to socket Mechanical & Electrical reset Reset Inhibitor High DC breaking capacity High burden operation to comply with capacitor discharge test requirement Back EMF suppression diode & protection against transient voltage as standard option Description The KDN-R8 relay is a plug-in fast trip bistable tripping relay that features 8 changeover (C/O) contacts. The contacts of this relay remain in the last powered position, and the position is clearly shown to the user via a position- indicator. The KDN-R8 relay has a trip time less than 10 ms. Standard equipped with magnetic arc blow-out for high breaking capacity and long contact life. Including mechanical reset button. Input voltage must be a rising edge with - minimum slew rate: 1 V/ms - minimum time: 10 ms Connection diagram Please note the relay will leave production in open state (with open armature at the left side, flag is green) with all contacts in the position shown in the connection diagram. Due to severe shocks far exceeding maximum levels mentioned in IEC 61373 (Category I, Class B, Body mounted), it can happen the left armature closes and stay closed. Therefore after installation all relays must be checked on correct state of the contacts and activate both coils 10 times alternately for correct operation. Timing diagram Application Rugged plug-in relays for extreme reliable, long endurance applications in harsh environment. These relays are designed for demanding industrial applications such as power utilities and petrochemical industries. The KDN-R8 relay is used in applications where the contacts are set and reset with permanent power or impulses. Remark: *Never energize the trip or reset coil when the reset push button is depressed. Adherence to these remarks is essential for the proper and safe operation of the Relay.

Options Dimensions (mm) • Au; Gold plated contacts (10 pm) • Extra dust protection • High resistance to welding (AgSnO2 contacts) • Double make/double break contacts Remark: Not all combinations possible The unique KDN-R8 relay with all its options has been designed in close cooperation with customers from the power utility industry. The Solve-All relay application concept offers ultimate flexibility to design and supply tailor made KDN-R8 relays. For more information see the respective datasheets For more detailed technical specifications, drawings and ordering information, go to the product...

Make contacts Operating Time *All Speeds are first touch excluding bounce time. Above data is only for electrical set and reset. The KDN-R8 tripping relay is designed for high burden operation, making it suitable for application in high-security circuit breaker tripping circuits, particularly where the initiating contact may be located remotely from the relay. The high burden configuration of the KDN-R8 relay also facilitates the satisfactory operation of external series elements. This high burden design provides the KDN-R8 relay with maximum immunity to electrical disturbances and noise. The...

Datasheet: KDN-R8 v01.7 Page 4/14 www.morssmitt.com

OptionsAvailable options for KDN-R8 relay according ths Solve-All relay application concept. Code Standard options Coloured cover and keying of relay on socket on request Remark: For application support or technical product support, contact your local Mors Smitt sales office (see contact details on last page).

In this section the most common breaking capacity for DC-voltage / inductive load possibilities are presented with the different options and contact configurations within the D-relays series. Breaking capacity 8 C/O contacts Magnetic arc blow out Contact gap: 0.7 mm

Electrical life expectancy and breaking capacity The life expectancy values shown below are based on factory tests. These values could be different in real life ap-plications as environmental conditions, switching frequencies and duty cycles will influence these values. Putting more contacts in series (Y) will increase breaking capacity and life expectancy significantly. AC and DC current breaking capacity versus life expectancy in millions of cycles for KDN-BR8. Rate of contacts opening and closing = 600 operations per hour. AC Current breaking capacity at cosp = 1 By connecting 2 contacts in...

Mounting possibilities/sockets Surface/wall mounting For PCB mount: use 2x V32 according to pin layout. For more details see datasheets of the sockets on www.morssmitt.com Datasheet: KDN-R8 v01.7 Page 8/14 www.morssmitt.com

Rack Mount Rear Connect V87-2 with Flush Mounting Socket and Kit Surface Mount Rear Connect V87 with Flush Mounting Socket Panel cut-out to mount surface rear connect base. Datasheet: KDN-R8 v01.7 Page 9/14 www.morssmitt.com

XnjMors Smitt A Wabtec Company Panel cut-out to flush mount relay with rear connect.

Mechanical keying relay and socket (optional) Function: • To prevent wrong installation • To prevent damage to equipment • To prevent unsafe situations Using keyed relays and sockets prevents a relay is inserted in a wrong socket. For example it prevents that a 24 VDC relay is put in a 110 VDC circuit. Positive discrimination is possible per different function, coil voltage, timing, monitoring, safety and non-safety. The D relay socket keying option gives 8 x 8 = 64 possibilities. Upon ordering the customer simply indicates the need for the optional keying. Mors Smitt will assign a code to the...