Solid-state Relay Provides Three Operating Functions in a Compact Package • Prevents burnouts in 3-phase induction motors due to overcurrent, open-phase, or reverse-phase. • LEDs indicate operation of the selected operating function. • Wide setting ranges: current: 1 to 160 A; operating time: 1 to 40 s. • Protects the motor from reversing without starting it. The SE cannot be used with circuits with distorted waveforms, inverter circuits, or capacitor loads. ■ Model Number Legend 6. Reset method None: Manual reset A: Automatic reset 7. Operating value None: 115% of the current SV E: 100% of the current SV 8. Product history N: New version 1. Basic model name SE: Motor Protective Relay 2. Protective functions K: Three possible operating functions: overcurrent, open- phase, or reverse-phase protection 3. Operating time characteristics for overload element Q: Instantaneous type: Fixed time at starting and instanta neous during operation None: Inverse type: Inverse operation both at starting and during operation None: Flush mount type Note: A 3-phase transformer (sold separately) must be used to operate Plug-in Relays at 380, 400, 415, or 440 VAC. Drop the primary voltage (380 to 440 VAC) to a 200-VAC secondary voltage before applying it to the SE-KP2EN or SE-KQP2EN. Overcurrent operating value: 100% of the current SV. Note: With start-up lock: fixed time-limit on start-up, instantaneous thereafter. Plug-in type requires a socket (8PFA1) which is sold separately. Refer to page 9 for the mounting conditions.

Overcurrent operating value: 115% of current SV.

Engineering DataOperating Characteristics Overcurrent Operating Time Characteristics Overcurrent Operating Time Characteristics (lnverse Type) (Instantaneous Type - Start-up Lock) Time Changeover Switch: x1

Operation■ SettingsMotor Relay Switch Settings LED Indicators The LEDs indicate which function is in operation. OPEN refers to open-phase, OC refers to overcurrent, and RVS refers to reverse-phase. Manual Reset The reset button will pop out about 4 mm when the relay has been tripped. After the relay has operated, reset by pressing this button. Disconnect the power supply before resetting for reverse-phase operation. Function Setting DIP SW The three ON/OFF switches enable or disable the three functions. The functions can be enabled in any combination. With the open-phase function, the H/L switch...

SE Selecting the Current Converter The current requirements of the motor determine the current range of the Motor Protective Relay, and whether the SET-3A or SET-3B Current Converter should be used, as shown in the following table. Motor specifications kW Motor Protective Relay A Current Converter Current range Note: 1. Connect to the secondary of a commercial current transformer for motors exceeding 37 kW. 2. Connect a commercial current transformer when using high-voltage motors or low-voltage high-capacity motors. Installation ■ Internal Circuit Inverse Type OC: overcurrent LED OPEN: open-phase...

■ Connections External Connections Manual Operation Low-voltage Circuit R Automatic Operation Low-voltage Circuit R Alarm buzzer Electromagnetic contactor Automatic contact Electromagnetic contactor High-tension Motor No-voltage Tripping Circuit Manual Operation Low-voltage Circuit Δ Start) Phase advancing capacitor SET-3 Current Converter SE series Motor Protective Relay SE series Motor Protective Relay (C+) (C−) (U) (V) Phase advancing capacitor Alarm buzzer Alarm buzzer Alarm buzzer No-voltage tripping coil Oil circuit breaker Magnet contactor 6 6 SE series Motor Protective Relay Phase advancing...

SE Manual Operation Low-voltage Circuit (When using a SE-K@P2@N in a 400/440 VAC Circuit) R Automatic Operation Low-voltage Circuit (High-capacity Motor) Magnet contactor Stop Alarm buzzer Alarm buzzer Automatic contact SE series Motor Protective Relay Magnet contactor Phase advancing capacitor Current transformer SE-K@P2@N Motor Protective Relay Phase advancing capacitor Manual Operation Low-voltage Circuit (Using the Overcurrent and Open-phase Functions) T Control power supply Stop Stop Start Alarm buzzer Alarm buzzer Magnet contactor Magnet contactor SE series Motor Protective Relay SE series...

Dimensions Note: All units are in millimeters unless otherwise indicated. Plug-in Socket Terminal SE-KP@N, SE-KQP@N The Height of DIN Rail Mounting Flush Mount Type SE-K@N, SE-KQ@N Panel Cutout Three, 20-dia. through holes Mounting Holes Four, 6-dia. mounting holes or four, M5 mounting screw holes 33.5 112 Note: The SE-PT400 can be used for all 200/220/240-VAC SE Relays. Primary voltage: 380 to 480 VAC Secondary voltage: 190 to 240 VAC Note: This Adapter is used to replace existing flush mount models with new models. Plate material: Steel plate (thickness: 2.0 mm) Color: Black (Munsell N1.5)

■ Testing Method With the circuit shown below, the characteristics listed in the following table can be tested. Determine the number of conductor runs through the holes of the current transformer in accordance with the operating current range of the Motor Protective Relay and by referring to the table in the section Selecting the Current Converter. 3^SD: 3-phase voltage regulator (5 to 15 A) A: AC ammeter SWi: knife switch (three-phase) SW2: toggle switch

■ Checking Operation Checklist After Connection and Before Starting Motor Check the Current Converter for the proper number of conductor runs through holes and the proper direction. Relay operates instantaneously Test Operation Corrective action Apply control power supply to the relay Change the phasesequence of 3-phase voltage properly. Check the Current Converter and Motor Protective Relay for connection with proper polarity. Press the test button (for longer than the set time). Check the phase-sequence of 3-phase voltage (for 3E relays). Does the relay operate? Check for: 1. Loose terminal...

Questions and Answers When using the SE as a 2E (overload and open-phase) relay, can the control power supply voltage be supplied separately from the motor circuit? Complete open-phase loss Why is the control power supply 100/110 V? The main reason the SE uses a 100/110-V control power supply is because 100/110 V is applicable to high-voltage motor protection. With a high-voltage motor, the voltage is first reduced with a potential transformer, and the secondary side is connected to the SE. When using the SE as a 2E (overload and open-phase) relay, a normal 100-V power supply can be used without...