Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Power Switching Devices
POWER SERIES™
Watlow has manufactured solid state power controllers
for over forty years. Watlow’s POWER SERIES™ is a
microprocessor-based product that features application
flexibility unmatched by any other silicon controlled
rectifier (SCR) power controller on the market today.
Watlow’s POWER SERIES controllers include single
and three-phase models from 65 to 250 amperes. Field
configurable phase-angle or zero-cross firing improves
application flexibility on site where needed.
50/60Hz independent operation allows utilization
almost everywhere in the world without special calibration
considerations. Serial communication via Modbus® RTU
allows setup and monitoring of load status from a
computer station or control room.
On-board semiconductor fusing improves reliability by
protecting the SCRs from heater short circuits. Plus,
on-board heater bakeout and control diagnostics can
help eliminate initial start up problems. All these benefits
are in a touch-safe package that can be quickly and
easily mounted in a control cabinet.
Watlow’s POWER SERIES controllers are UL® and
C-UL® listed, ensuring that they meet world safety and
operational standards.
Features and Benefits
200KA short circuit current rating (SCCR)
• Minimizes damage in the event of a short circuit
Microprocessor-based technology
• Extremely versatile and field configurable
Snap-fit on a pre-mounted plate
• Simplifies installation
Models 65 through 250 amperes rating
• Handles a wide range of loads
UL® 508 listed, C-UL® and CE with filter
• Meets applications requiring agency approval
Adjustable soft start
• Provides application flexibility
Heater and control diagnostics capability
• Monitors actual heater and controller performance
Electrically touch-safe package
• Enhances safety for installer and users
Serial communications with Modbus® RTU protocol
• Provides computer control and/or monitoring
Multizone capability
• Increases application flexibility and reduces
panel space
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Power Switching Devices
POWER SERIES
Specifications
Power Bases
• Single-phase, (2 SCRs)
• 3-phase, 2-leg control, (4 SCRs)
Resistive load only, zero-cross firing only
• 3-phase, 3-leg control, (6 SCRs)
• 3-phase, 3-leg control, (6 SCRs) for 4-wire wye loads
• Multizone, two and three single-phase zones
Output Control Options
• Zero-cross control, fixed time base
• Time base one or four seconds with digital
programmer
• Zero-cross control, variable time base
• Phase-angle control and phase-angle control with
current limit (not for 3-phase, 2-leg models)
• Soft start factory default four seconds upon
power-up, and adjustable from 0.0 to 120 seconds
• Soft start upon input signal change, output rate of
change adjustable to limit max. rate of change from
0.1 to 100% per 0.1 second. Factory default 10%
• Current transformer included when required
• Line voltage compensated (variable time base and
phase angle controllers only)
• Standby or non-operational mode
Output Voltage and Current Rating
• 24 to 120VAC (+10%, -15%)
• 200 to 480VAC (+10%, -15%)
• 200 to 600VAC (+10%, -15%)
• 65 through 250A per pole, model dependent; see
amperage chart on the POWER SERIES spec sheet
on the Watlow web site
• Min. load 1A rms ac
• Max. leakage current 5mA
• 200KA SCCR, Type 2 approved with the
recommended fusing; see user manual
Alarms
• Single alarm relay
• Latching or non-latching
• Separate high and low values
• Alarm silencing (inhibit) on power up for alarm
• Alarm indication LEDs, shorted SCR, open heater,
fuse
• Electromechanical relay, Form C contact, software
configurable
• Min. load current 10mA @ 5VDC
• Rated resistive loads: 3A @ 250VAC or 30VDC
max., inductive load rating 1.5A with a power factor
≥ 0.4 without contact suppression
Heater Bakeout
• For single-phase (phase to neutral) and 3-phase 6
SCR models only (not for 3-phase, 2-leg models)
• Soft start with over current trip, runs until programmed
bakeout time expires, then goes burst or phase-angle
firing. Factory default of 24 hours
• Adjustable 0 - 9999 minutes with over-current trip
• Internal current transformer included
Command Signal Input
Analog
• Input signal: field selectable and scalable, 0 to 20mA or
0 to 10VDC
• Default input signal: 4 to 20mA
• Manual control input via digital programmer/display
• Voltage input impedance 11kΩ nominal
• Current input impedance 100Ω nominal
Digital
• On-board digital programmer/display and optional
serial communications
Retransmit
• Field selectable and scalable, 0 to 20mA with
800Ω max. load or 0 to10VDC with 1KΩ min. load
• Default: 4 to 20mA
• Resolution:
mA ranges = ±5μA
VDC ranges = 2.5mV nominal
• Calibration accuracy:
mA ranges = ±20μA
VDC ranges = 10mV nominal
• Temperature stability: 100ppm/°C
Digital Programmer/Display and Communications
Capabilities
• Programming functions
• Adjust input and output control type, alarms and
soft start, heater bakeout and current limit prompts
• Monitoring functions
• Display input and output values along with actual
output current
• Data retention of digital programmer/display upon
power failure via nonvolatile memory
Serial Communications
• RS-232 for single drop control
• EIA-485 for single or multidrop control
• 32 units maximum can be connected. With
additional 485 repeater hardware, up to 247 units
may be connected
• Isolated
• Modbus® RTU protocol
• 1200, 2400, 4800, 9600, 19200 baud rates
Controller Power Supply
• Universal line voltage input range 100 to 240VAC
(+10%, -15%) at 55VA max.
• 50/60Hz ± 5% line frequency independent
• Controller line voltage for electronic power supply can
be run on separate line voltage
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Power Switching Devices
POWER SERIES
Specifications (Continued)
Natural Convection and Fan Cooled Models
• Cabinet venting may be required
• See Amperage Chart with Ordering Information for
available configurations
Power Dissipation (Watts)
• Approximately 1.25 watts/ampere per controlled leg
Isolation
• Command signal to load and line/load to ground
2200VAC min.
• On-board semiconductor fuses provide SCR protection
Mounting
• Output Amperage Rating F35: back panel
• Other Output Amperage Ratings: removable mounting
plate
High Current Terminals
• Touch safe
• 3/8 in. (10 mm) Allen head compression terminals will
accept 6 AWG to 350 MCM wire. Allen wrench
adapter (included) for 3/8 in. (10 mm) socket, 6 point
only
• Torque to 180 in.-lbs (20.3 Nm)
• Wire strip to 11/8 in. (30 mm)
• Requires 194°F (90°C) wire insulation rating on line
and load terminals
Controller Terminals
• Touch safe
• 1/8 in. (2.5 mm) blade screwdriver, accepts
12-22 AWG or 2 ea. 22-18 AWG wires
• Torque to 8 in.-lbs (0.9 Nm)
• Wire strip to 0.24 in. (6 mm)
Operating Environment
• 122°F (50°C) base rating
• 32 to 140°F (0 to 60°C) fan cooled
• 32 to 149°F (0 to 65°C) natural convection cooled
• 0 to 90% RH, non-condensing
• Meets EN 50178, Pollution degree three
Storage Temperature
• -40 to 185°F (-40 to 85°C)
Shipping Weight
• Output Amperage Rating F35: 38 lbs (17.2 kg)
• Other Output Amperage Ratings: 23 lbs (10.3 kg)
Agency Approvals
• UL® 508 listed, File #E73741, Vol. 3, Sec. 2
• C-UL® listed to C22.2 NO. 14
• CE 2004/08/EC (EN 61326-1), Class A with filter,
CE 2006/95/EC (EN 50178)
Dimensions (Output Amperage Ratings:
N20, N25, N30, F20, F25 or F30)
Front View
1
2
3
POWER SERIES
Solid State Power Controller
14 in.
354 mm
4
5
6
Top View Power Series Top View
7.9 in.
200 mm
7.5 in.
191 mm
Mounting Plate
Release Tab
Mounting Holes (4)
0.27 in. (7 mm)
Key Slots
7.00 in.
(178 mm)
1.53 in.
(39 mm)
4 in.
(102 mm)
0.97 in.
(25 mm)
5.93 in.
(151 mm)
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Power Switching Devices
POWER SERIES
13.3 in.
(337 mm)
Dimensions (Output Amperage
Rating: F35)
12 in.
(305 mm)
0.28 in.
(7.1 mm)
POWER SERIES
Solid State Power Control
9.2 in.
(234 mm)
16.6 in.
(421 mm)
14 in.
(356 mm)
7 in.
(178 mm)
7.5 in.
(191 mm)
Bottom View
Mounting Flange
(Already Installed)
Single-Phase Configuration
This configuration can be purchased with any or all the
features available on the POWER SERIES, based on
customer preference. It is intended for resistive heaters,
but can also be used on transformer connected loads in
the phase angle firing mode.
Three-Phase, Two Leg Configuration
This configuration is intended for zero cross firing only
into a stable resistive heater. Typically, a three-phase
delta or ungrounded wye connected heater is used and
only two of the three VAC line phases are switched. The
third phase is a direct connection through a bussbar on
board the POWER SERIES. Heater current monitoring
and kVA options are available via the heater diagnostics
option.
Three-Phase, Three-Leg Configuration
All POWER SERIES options are available with this
configuration. It works well with phase angle firing into a
three-phase, three-wire wye or delta connected heater.
In this configuration, the more common applications are
transformer connected loads with heaters requiring a soft
start and/or current limiting.
The three-phase, four-wire configuration is intended for
zero cross firing into a three-phase grounded wye/star
heater. (This is a separate hardware option, model
number dependent.)
Front View
1.3 in.
(33 mm)
Single-Phase, Multizone Configuration
This configuration is available in two and three
single-phase zones and all the features of a single-phase
unit are available. (Note that there is only one alarm relay
and all zones in the controller must use the same control
method.)
Heater Diagnostics
Heater diagnostics may include some or all of the
features that require heater current monitoring, depending
on the model selected. Heater current monitoring is only
available with heater diagnostics installed on the
controller. The features dependent on heater current
monitoring are heater bakeout, current limiting, heater
kVA monitoring, retransmit and heater monitoring alarms
such as open heater, heater out of tolerance, load
balance and shorted SCR detection/error. Heater
diagnostics must also be installed if you need phase
angle control with current limit.
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
Power Switching Devices
POWER SERIES
Ordering Information
Part Number
③
④
Phase
Heater
Diagnostics
①②
⑤⑥⑦
Output
Amperage
Rating
⑧
Output
Voltage
Rating
-
PC
③
⑨
⑩
⑪⑫
Comm.
Feedback/
Retransmit
Custom
⑨
Phase
1 =
1-phase
2 =
3-phase/2-leg control, (4 SCRs), zero cross only
3 =
3-phase/3-leg control, (6 SCRs)
4 =
3-phase/4-wire, wye connected load
⑩
8 =
2 single-phase zones
9 =
3 single-phase zones
0 =
1 =
④
0 =
1 =
0 =
1 =
Heater Diagnostics
Output Amperage Rating
See amperage chart below
⑧
24 to 120V
B=
200 to 480V
C=
200 to 600V
POWER SERIES Features
Removable Mounting Plate
Power Series snaps on a premounted, removable subplate.
1
2
3
Terminal Cover
Electrically touch-safe
package.
4
5
6
AA =
No Watlow logo with agency approval marks
XX =
01 =
Custom, contact your Watlow representative for options
Select for PC8 or PC9 using single-phase power supply,
Watlow logo
Select for PC8 or PC9 using multi-phase power supply,
Watlow logo
Ground Lug
Built in, designed for easy
ground connections.
On-Board Fan
A fan is integrated into
the package on forced
air cooled models to
eliminate separate power
connection for fan.
Digital Programmer/Display
For controller configuration,
setup and monitoring features.
None
Amperage Chart—122˚F (50˚C)
I/O Port
Input, retransmit
output, communications
and alarms.
Fuse Cover
Slides up and down for fuse
maintenance and covers the
high voltage components.
Custom
00 =
03 =
Output Voltage Rating
A=
Feedback/Retransmit
None
Load current feedback (0-10V or 0-20mA scalable
retransmit output) (Must have heater diagnostics selected)
⑪⑫
None
Heater diagnostics (required for any heater current
monitoring or current limiting
⑤⑥⑦
Communications
None
EIA/TIA-232/485 communications, opto-isolated,
(field selectable)
Allen Wrench
Used to torque terminals
one to six and ground lug.
Single-Phase
Non
Fan
Cooled
Fan
Cooled
3-Phase, 2-Leg
and 2 SinglePhase Zones
3-Phase, 3-Leg,
3 Single-Phase
Zones and
4-Wire Model
Code
Amp
Code
Amp
Code
Amp
N20
100A
N20
80A
N20
65A
N25
140A
N25
105A
N25
85A
N30
165A
N30
120A
N30
105A
F20
125A
F20
120A
F20
90A
F25
200A
F25
160A
F25
140A
F30
250A
F30
185A
F30
155A
N/A
N/A
F35
250A
F35
225A
Note: For current ratings at other temperatures see the rating curves in
the POWER SERIES User’s Manual available at www.watlow.com.
Replacement Fuses for Power Series
Watlow Part Number
Description
Bussmann Part Number
0808-0102-0100
100 amp @ 600VAC
170M1317
0808-0102-0125
125 amp @ 600VAC
170M1318
0808-0102-0160
160 amp @ 600VAC
170M1319
0808-0102-0200
200 amp @ 600VAC
170M1320
0808-0102-0250
250 amp @ 600VAC
170M1321
0808-0102-0315
315 amp @ 600VAC
170M1322
Thermal Devices, Inc. Mount Airy, Maryland USA www.thermaldevices.com
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