Watlow Power Series
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My market
Electric furnaces & ovens
Petrochemical & process
Semiconductor

Benefits
Key benefits of the Power Series
Save money with SCR control

More information
Specification sheet (PDF)
User's manual (PDF)
Ordering information
Power controller case histories
SCR Power Controls brochure (PDF)
SCR Power Control education (PDF)
PowerPoint® library
Video clip collection
Watlow web site

Go directly to information about...
Agency approvals
Alarms
Amperage ratings
Communications
Current limiting
Field-selectable input
Hardware overview
Heater bakeout
Heater diagnostics option
Heater tolerance detection
Installation features
Maximum rate of change
Operator interface
Ordering information
Phase angle control
Phase configurations
Retransmit
SCR control
Selection chart, control methods
Soft start
Voltage compensation
Zero cross control

Copyright © 2000, Watlow Electric Manufacturing Company. All rights reserved.
Legal notices
Amperage ratings

The Power Series is available in the amperage ratings listed below. Base ratings are at 50°C (122°F).

Single phase
Single phase, two zone
Single phase, three zone
Three phase, two leg
Three phase, three leg


Single phase

Fan cooled:
125 Amps
200 Amps
250 Amps
Natural convection cooled:
100 Amps
140 Amps
165 Amps

Rating curve for single phase, fan cooled

Rating curve for single phase, convection cooled

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Three phase, two leg
or single phase, two zone

Fan cooled:
120 Amps per leg
160 Amps per leg
185 Amps per leg
Natural convection cooled:
80 Amps per leg
105 Amps per leg
120 Amps per leg

Rating curve for 3-phase 2-leg, fan cooled

Rating curve for 3-phase 2-leg, convection cooled

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Three phase, three leg
or single phase, three zone

Fan cooled:
90 Amps per leg
140 Amps per leg
155 Amps per leg
Natural convection cooled:
65 Amps per leg
85 Amps per leg
105 Amps per leg

Rating curve for 3-phase 3-leg, fan cooled

Rating curve for 3-phase 3-leg, convection cooled

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