Cut Sheet

© 2016 Littelfuse Protection Relays & Controls
Protection Relays
Motor and Pump Protection - 3-Phase Motor Protection
www.littelfuse.com/
Rev: 1-A-062816
www.littelfuse.com/777
Ordering Information
MODEL LINE VOLTAGE
MOTOR FULL
AMP RANGE
DESCRIPTION
777-P2 200-480VAC
2-800A (external CTs
required above 90A)
Provides low and high power trip*, linear overcurrent trip, and 480VA @ 240VAC output SPDT
relay contacts
777-LR-P2 200-480VAC
1-800A (external CTs
required above 9A)
Protects low range motors when wired directly or with 10-800 FLA with use of external CTs
777-HVR-P2 340-480VAC
2-800A (external CTs
required above 90A)
Provides low and high power trip*, linear overcurrent trip, and 470VA @ 600VAC output SPDT
relay contacts. Required when a control power transformer (CPT) is not used with a 480V system
777-HVR-LR-P2 340-480VAC
1-800A (external CTs
required above 9A)
Provides low and high power trip*, linear overcurrent trip, and 470VA @ 600VAC output SPDT
relay contacts. Required when a control power transformer (CPT) is not used with a 480V system
777-575-P2 500-600VAC
2-800A (external CTs
required above 90A)
Provides low and high power trip*, linear overcurrent trip, and 480VA @ 240VAC output SPDT
relay contacts. Used in Canada and NE USA where 575V utility power services are common
777-575-LR-P2 500-600VAC
1-800A (external CTs
required above 9A)
Provides low and high power trip*, linear overcurrent trip, and 480VA @ 240VAC output SPDT
relay contacts. Used in Canada and NE USA where 575V utility power services are common
777-MV-P2 100-240VAC
10-800A with
external CTs
Provides low and high power trip*, linear overcurrent trip, and 480VA @ 240VAC output SPDT
relay contacts. Designed for Medium Voltage applications where both PTs and CTs are used. Has
built in multipliers for 25.5, 50.5, 100.5 CTs. The voltage unbalance, single-phase and reverse
phase protection can be disabled for applications where only the PTs are used
777-HRG-P2 200-480VAC 2-90A only
Provides low and high power trip*, linear overcurrent trip, and 480VA @ 240VAC output SPDT
relay contacts. Designed for high resistance grounding systems that incorporate an external
zero-sequence CT that correspond with the built in multipliers to detect ground faults
777-LR-HRG-P2 200-480VAC
10-800A (external CTs
required, external
Overload relays designed for high resistance grounding systems that incorporate an external
zero-sequence CTs that correspond with the built in multipliers to detect ground faults
777-575-HRG-P2 500-600VAC 2-90A only
Provides low and high power trip*, linear overcurrent trip, and 480VA @ 240VAC output SPDT
relay contacts. Used in Canada and NE USA where 575V utility power services are common.
Designed for high resistance grounding systems that incorporate an external zero-sequence CT
that correspond with the built in multipliers to detect ground faults
777-575-LR-HRG-P2 500-600VAC
10-800A with
external CTs
Provides low and high power trip*, linear overcurrent trip, and 480VA @ 240VAC output SPDT
relay contacts. Used in Canada and NE USA where 575V utility power services are common.
Designed for high resistance grounding systems that incorporate an external zero-sequence CT
that correspond with the built in multipliers to detect ground faults
777-FT 200-480VAC
2-800A (external CTs
required above 90A)
Provides linear overcurrent trip and 480VA @ 240VAC output SPDT relay contacts. Also known
as shock relay, it is designed for fast linear trip applications. Overcurrent trip delay can be set
ranging from less than 500ms - 70 seconds. Low trip delay is ideal in chain drive and drive
linkage applications to prevent breaking in overload or jam situations. Other applications include
sewage clarifiers, mixers, augers, and conveyors. Longer trip delay is ideal for motor test panels
in rewind shops. Also includes adjustable motor acceleration time and overcurrent trip delay
time when the faster linear trip mode is used
777-TS 200-480VAC
2-800A (external CTs
required above 90A)
Provides 480VA @ 240VAC output SPDT relay contacts. For use with Subtrol
®
equipped Franklin
submersible motors to detect high motor temperatures
777-LR-TS 200-480VAC 1-9A only
Provides 480VA @ 240VAC output SPDT relay contacts. For use with Subtrol
®
equipped Franklin
submersible motors to detect high motor temperatures
777-575-TS 500-600VAC
2-800A (external CTs
required above 90A)
Provides 480VA @ 240VAC output SPDT relay contacts. For use with Subtrol
®
equipped Franklin
submersible motors with nominal 500-600VAC range to detect high motor temperatures
777VA-02 200-480VAC
2-800A (external CTs
required above 90A)
Provides low and high power trip*, linear overcurrent trip, and 480VA @ 240VAC output SPDT
relay contacts. Has restart delay 1 setpoints of 2-500 minutes and undercurrent trip delay
setpoints of 2-60 minutes.
777VA-03 200-480VAC
2-800A (external CTs
required above 90A)
Provides low and high power trip*, linear overcurrent trip, and 480VA @ 240VAC output SPDT
relay contacts. For use with static and rotary single to 3-phase converters. High and low
voltage trip feature only applies to the utility supplied power. Works well with unloaded phase
converters because the relay ignores severely unbalanced voltages
* Network programmable only
777 SERIES