Omron K8AB-PM Series Manual

Three-phase Phase-sequence Phase-loss Relay
K8AB-PM
Ideal for monitoring 3-phase power supplies
for industrial facilities and equipment.
• Monitor overvoltages, undervoltages, phase sequence, and
phase loss for three-phase 3-wire or 4-wire power supplies with
just one Unit.
Switch setting for 3-phase 3-wire or 3-phase 4-wire power
supply.
• Two SPDT output relays, 6 A at 250 VAC (resistive load).
Output overvoltages and undervoltages using separate relays.
• World-wide power specifications supported by one Unit
(switchable).
• Output status can be monitored using LED indicator.
Model Number Structure
■ Model Number Legend
K8AB-@@
1 2 3
1. Basic Model
K8AB: Measuring and Monitoring Relays
2. Functions
PM: Three-phase Phase-sequence Phase-loss Relay (Simultaneous upper and lower monitoring)
3. Rated Input Voltage
1: 115, 127, 133, 138, 200, 220, 230, 240 VAC
2: 220, 230, 240, 277, 380, 400, 415, 480 VAC
Single K8AB Monitors 3-phase Power Supply with 3 or 4 Wires
Monitoring Relays can be used to monitor 3-phase power supplies with 3 or 4 wires simply by changing DIP switch settings.
A Single K8AB Can Monitor a 3-phase Power Supply Anywhere in the World
Reduces Maintenance Parts Inventory
K8AB-P@1
K8AB-P@2
Cat. No. N146-E1-02
Phase to phase voltage (3 wires)
L1 L2 L3
400VAC
400VAC
400VAC
SW3
SW4
ON
SW2
OFF
ON
SW2
OFF
Three-phase Phase-sequence Phase-loss Relay
Phase to neutral voltage (4 wires)
L1 L2 L3
230VAC
230VAC
230VAC
ON
ON
P-N 138 V
P-P 240 V
P-N 277 V
P-P 480 V
N
ON OFF
OFF ON
133 V 127 V
230 V 220 V
240 V 230 V
415 V 400 V
K8AB-PM
OFF
OFF
115 V
200 V
220 V
380 V
1