Datasheet
Specifications are subject to change without notice (03.09.14)
1
Monitoring Relays
Product Description
Ordering Key
Housing
Function
Type
Item number
Output
Power supply
• TRMS 3-phase over and under voltage,
phase sequence and phase loss monitoring relay
• Detects when all 3 phases are present and have the
correct phase sequence
• Detects if all the 3-phase-phase or phase-neutral volt-
ages are within the set limits
• Upper and lower limits separately adjustable
• Measures its own power supply
• Adjustable voltage on relative scale
• Adjustable delay function (0.1 to 30 s)
•
Output: 5 A SPDT relay N.E.
• For mounting on DIN-rail in accordance with
DIN/EN 50 022
• 17.5 mm DIN-rail housing
• LED indication for relay, alarm and power supply ON
Type Selection
Mounting Output Supply: 208 to 480 VAC
DIN-rail SPDT DPB 51 C M44
Input
L1, L2, L3, N Terminals L1, L2, L3, N
Measures its own supply
Note: Connect the neutral only
if it is intrinsically at the star
centre
Measuring ranges
208 to 480 ∆ VAC 177 to 550 ∆ VAC
Ranges
Upper level +2 to +22%
of the nominal voltage
Lower level -22 to -2%
of the nominal voltage
Note: The input voltage
must not exceed the maximum
rated voltage or drop below
the minumum rated voltage
reported above.
Hysteresis
Set points from 2 to 4% 1%
Set points from 4 to 22% 2%
True RMS 3-Phase, 3-Phase+N, Multi-function
Type DPB51
Input Specifications
Output SPDT relay
Rated insulation voltage 250 VAC
Contact ratings (AgSnO
2
) µ
Resistive loads AC 1 5 A @ 250 VAC
DC 12 5 A @ 24 VDC
Small inductive loads AC 15 2.5 A @ 250 VAC
DC 13 2.5 A @ 24 VDC
Mechanical life ≥ 30 x 10
6
operations
Electrical life ≥ 10
5
operations
(at 5 A, 250 V, cos ϕ = 1)
Operating frequency ≤ 7200 operations/h
Dielectric strength
Dielectric voltage 2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
Output Specifications
DPB 51 C M44
3-phase or 3-phase+neutral
line voltage monitoring relay
for phase sequence, phase
loss, over and under voltage
(separately adjustable set
points) with built-in time
delay function.
Supply ranges from 208 to
480 VAC covered by one
multivoltage relay.
17.5 mm wide housing suit-
able both for back and front
panel mounting.