Protection Relays
Voltage Monitoring Relays
350 SERIES
3-phase voltage/phase monitor
Description
The 350 Series is a heavy-duty voltage monitor. This product
should be used when high current relays or dual contacts are
required, or 480V controls are used. Since the 350 Series uses
heavy-duty relays, it comes in fixed voltage range models rather
than a dual auto-ranging version like the Model 250.
The 350200 has a 15A general purpose contact. The 350400
provides a SPDT (Form C) relay rated to switch up to 600V,
allowing the use of 480V controls, eliminating the need for a
control power transformer to step the voltage down to
120-240V. Several DPDT (two Form C contacts) relay models
are also available.
The 350 microcontroller-based family of products are low cost
yet highly advanced solutions to heavy-duty problems. The 350
includes advanced single LED diagnostics. Five different light
patterns distinguish faults and normal operating conditions.
Other options such as high voltage trip and adjustable restart
delay are available.
Wiring Diagram
Features & Benefits
FEATURES
Proprietary
microcontroller
based circuitry
Advanced LED indication
Adjustable restart delay
(-2 models) settings
600V rated relay
contacts available
on some models
BENEFITS
Constantly monitors 3 phase voltage to protect
against harmful line conditions, even before the
motor is started
Provides diagnostics which can be used for
troubleshooting and to determine relay status
Allows staggered start up of multiple motors, after
a fault, to prevent a low voltage condition
Eliminates the need for a control transformer to step
voltage down to 120 - 240V for a control circuit
Ordering Information
MODEL
LINE VOTAGE DESCRIPTION
MODEL
LINE VOTAGE DESCRIPTION
350200
3502002
35020026
35020028**
35020029
350400
3504002
35040025
190-240VAC
190-240VAC
190-240VAC
190-240VAC
190-240VAC
380-480VAC
380-480VAC
380-480VAC
SPDT, fixed trip and restart delay
SPDT, fixed trip and variable restart delay
(manual, 2-300s)
DPDT, 2 relays (1)10a. (1) 15A; fixed trip and
variable restart delay (manual, 2-300s)
DPDT, 2 relays 15A; variable restart delay
(no manual reset)
SPDT, fixed trip and variable restart delay
(manual, 2-300s), plus high voltage detection
SPDT, fixed trip and restart delay
SPDT, fixed trip and variable restart delay
(manual, 2-300s)
DPDT, fixed trip and variable restart delay
(manual, 2-300s)
35040026
35040028**
35040029
350600
3506002
35060026
35060028**
35060029
380-480VAC
380-480VAC
380-480VAC
475-600VAC
475-600VAC
475-600VAC
475-600VAC
475-600VAC
DPDT, 2 relays (1)10a. (1) 15A; fixed trip and
variable restart delay (manual, 2-300s)
DPDT, 2 relays 15A; variable restart delay
(no manual reset)
SPDT, fixed trip and variable restart delay
(manual, 2-300s), plus high voltage detection
SPDT, fixed trip and restart delay
SPDT, fixed trip and restart delay
(manual, 2-300s)
DPDT, 2 relays (1)10a. (1) 15A; fixed trip and
variable restart delay (manual, 2-300s)
DPDT, 2 relays 15A; variable restart delay
(no manual reset)
SPDT, fixed trip and variable restart delay
(manual, 2-300s), plus high voltage detection
** These units are not equipped with Manual Reset.
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/350
Rev: 1-A-062716
Protection Relays
Voltage Monitoring Relays
350 SERIES
Specifications
Input Characteristics
Line Voltage
350200
350400
350600
Frequency
Functional Characteristics
Low Voltage (% of setpoint)
Trip
Reset
Voltage Unbalance (NEMA)
Trip
Reset
Trip Delay Time:
Low Voltage
Unbalance & Phasing Faults
Restart Delay Time
After a Fault
After a Complete Power Loss
Output Characteristics
Output Contact Rating
SPDT (350200)
Pilot Duty
General Purpose
SPDT (350-400, 350-600)
DPDT (-6 Option)
190-240VAC
380-480VAC
475-600VAC
50*/60Hz
90%
93%
6%
4.5%
4 seconds
2 seconds
2 seconds
2 seconds
General Characteristics
Ambient Temperature Range
Operating
Storage
Trip & Reset Accuracy
Maximum Input Power
Terminal
Torque
Wire Size
Transient Protection
(Internal)
Safety Marks
UL
CSA
CE
Dimensions
-40° to 70°C (-40° to 158°F)
-40° to 80°C (-40° to 176°F)
±1%
5W
7 in.-lbs.
12-18AWG
IEC 61000-4-5;1995 ±6kV
UL508 (File #E68520)
22.2 No. 14 (File #46510)
IEC 60947-6-2
H
74.42 mm (2.93”);
W
133.86 mm (5.27”);
D
74.93 mm (2.95”)
1.05 lbs. (16.8 oz., 476.27 g)
#8 screws
DPDT (-8 Option)
480VA @ 240VAC
15A
470VA @ 600VAC
1-10A General Purpose
480VA @ 240VAC Pilot Duty
1-15A General Purpose
480VA @ 240VAC Pilot Duty
1hp @ 240VAC
2-15A General Purpose
480VA @ 240VAC Pilot Duty
1hp @ 240VAC
Weight
Mounting Method
Special Options
Opt. 2: Variable Restart Delay
Manual, 2-300 seconds adj.
Opt. 5: DPDT Relay
Opt. 6: 2 Relays (1) 10A, (1) 15A
Opt. 8: 2 Relays (2) 15A
Opt. 9: High Voltage (% of setpoint)
Trip
110%
Reset
107%
*Note: 50Hz will increase all delay timers by 20%.
© 2016 Littelfuse Protection Relays & Controls
www.littelfuse.com/350
Rev: 1-A-062716
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